Monitoring requirements for lead and
copper in tap water.
(a) Sample site location
(i) By the applicable date for commencement
of monitoring under R309-210-6(3)(d)(i), each water system shall complete a
materials evaluation of its distribution system in order to identify a pool of
targeted sampling sites that meets the requirements of this section, and which
is sufficiently large to ensure that the water system can collect the number of
lead and copper tap samples required in R309-210-6(3)(c). All sites from which
first draw samples are collected shall be selected from this pool of targeted
sampling sites. Sampling sites may not include faucets that have point-of-use
or point-of-entry treatment devices designed to remove inorganic
contaminants.
(ii) A water system
shall use the information on lead, copper, and galvanized steel when conducting
a materials evaluation. When an evaluation of this information is insufficient
to locate the requisite number of lead and copper sampling sites that meet the
targeting criteria in R309-210-6(3)(a), the water system shall review the
sources of information listed below in order to identify a sufficient number of
sampling sites. In addition, the system shall seek to collect such information
where possible in the course of its normal operations (e.g., checking service
line materials when reading water meters or performing maintenance activities):
(A) all plumbing codes, permits, and records
in the files of the building department(s) which indicate the plumbing
materials that are installed within publicly and privately owned structures
connected to the distribution system;
(B) all inspections and records of the
distribution system that indicate the material composition of the service
connections that connect a structure to the distribution system; and
(C) all existing water quality information,
which includes the results of all prior analyses of the system or individual
structures connected to the system, indicating locations that may be
particularly susceptible to high lead or copper concentrations.
(iii) The sampling sites selected
for a community water system's sampling pool ("tier 1 sampling sites") shall
consist of single family structures that:
(A)
contain copper pipes with lead solder installed after 1982 or contain lead
pipes; and/or
(B) are served by a
lead service line.
When multiple-family residences comprise at least 20 percent
of the structures served by a water system, the system may include these types
of structures in its sampling pool.
(iv) Any community water system with
insufficient tier 1 sampling sites shall complete its sampling pool with "tier
2 sampling sites", consisting of buildings, including multiple-family
residences that:
(A) contain copper pipes
with lead solder installed after 1982 or contain lead pipes; and/or
(B) are served by a lead service
line.
(v) Any community
water system with insufficient tier 1 and tier 2 sampling sites shall complete
its sampling pool with "tier 3 sampling sites", consisting of single family
structures that contain copper pipes with lead solder installed before 1983. A
community water system with insufficient tier 1, tier 2 and tier 3 sampling
sites shall complete its sampling pool with representative sites throughout the
distribution system. For the purpose of this paragraph, a representative site
is a site in which the plumbing materials used at that site would be commonly
found at other sites served by the water system.
(vi) The sampling sites selected for a
non-transient non-community water system ("tier 1 sampling sites") shall
consist of buildings that:
(A) contain copper
pipes with lead solder installed after 1982 or contain lead pipes;
and/or
(B) are served by a lead
service line.
(vii) A
non-transient non-community water system with insufficient tier 1 sites that
meet the targeting criteria in R309-210-6(3)(a)(vi) shall complete its sampling
pool with sampling sites that contain copper pipes with lead solder installed
before 1983. If additional sites are needed to complete its sampling pool, the
non-transient non-community water system shall use representative sites
throughout the distribution system. For the purpose of this paragraph, a
representative site is a site in which the plumbing materials used at that site
would be commonly found at other sites served by the water system.
(viii) Any water system whose distribution
system contains lead service lines shall draw 50 percent of the samples it
collects during each monitoring period from sites that contain lead pipes, or
copper pipes with lead solder, and 50 percent of the samples from sites served
by a lead service line. A water system that cannot identify a sufficient number
of sampling sites served by a lead service line shall collect first draw
samples from all of the sites identified as being served by such
lines.
(b) Sample
collection methods
(i) All tap samples for
lead and copper collected in accordance with this section, with the exception
of lead service line samples collected under R309-210-6(4)(c)(iii) and samples
collected under (b)(v) of this section, shall be first draw samples.
(ii) Each first-draw tap sample for lead and
copper shall be one liter in volume and have stood motionless in the plumbing
system of each sampling site for at least six hours. First draw samples from
residential housing shall be collected from the cold water kitchen tap or
bathroom sink tap. First-draw samples from a nonresidential building shall be
one liter in volume and shall be collected at an interior tap from which water
is typically drawn for consumption. Non-first-draw samples collected in lieu of
first-draw samples pursuant to paragraph (b)(v) of this section shall be one
liter in volume and shall be collected at an interior tap from which water is
typically drawn for consumption. First draw samples may be collected by the
system or the system may allow residents to collect first draw samples after
instructing the residents of the sampling procedures specified in this
paragraph. To avoid problems with residents handling nitric acid, acidification
of first draw samples may be done up to fourteen days after the sample is
collected. After acidification to resolubilize the metals, the sample must
stand in the original container for the time specified in
R309-200-4(3).
If a system allows residents to perform sampling, the system may not challenge,
based on alleged errors in sample collection, the accuracy of sampling
results.
(iii) Each service line
sample shall be one liter in volume and have stood motionless in the lead
service line for at least six hours. Lead service line samples shall be
collected in one of the following three ways:
(A) at the tap after flushing the volume of
water between the tap and the lead service line. The volume of water shall be
calculated based on the interior diameter and length of the pipe between the
tap and the lead service line;
(B)
tapping directly into the lead service line; or
(C) if the sampling site is a building
constructed as a single-family residence, allowing the water to run until there
is a significant change in temperature which would be indicative of water that
has been standing in the lead service line.
(iv) A water system shall collect each first
draw tap sample from the same sampling site from which it collected a previous
sample. If, for any reason, the water system cannot gain entry to a sampling
site in order to collect a follow-up tap sample, the system may collect the
follow-up tap sample from another sampling site in its sampling pool as long as
the new site meets the same targeting criteria, and is within reasonable
proximity of the original site.
(v)
A non-transient non-community water system, or a community water system that
meets the criteria for R309-210-6(7)(b)(vii), that does not have enough taps
that can supply first draw samples, as defined in R309-110, may apply to the
Director in writing to substitute non-first-draw samples. Such systems must
collect as many first draw samples from appropriate taps as possible and
identify sampling times and locations that would likely result in the longest
standing time for the remaining sites. The Director herein waives the
requirement for prior Director approval of non-first draw samples sites
selected by the system.
(d) Timing of
monitoring
(i) Initial tap sampling
The first six-month monitoring period for small, medium-size
and large systems shall begin on the following dates in Table 210-4:
TABLE 210-4 INITIAL LEAD AND COPPER MONITORING PERIODS System Size First six-month (# People Served) Monitoring Period Begins On Greater than 50,000 January 1, 1992 3,301 to 50,000 July 1, 1992 3,300 or less July 1, 1993
(A) All large systems shall
monitor during two consecutive six-month periods.
(B) All small and medium-size systems shall
monitor during each six-month monitoring period until:
(I) the system exceeds the lead or copper
action level and is therefore required to implement the corrosion control
treatment requirements under R309-210-6(2), in which case the system shall
continue monitoring in accordance with R309-210-6(3)(d)(ii), or
(II) the system meets the lead and copper
action levels during two consecutive six-month monitoring periods, in which
case the system may reduce monitoring in accordance with
R309-210-6(3)(d)(iv).
(ii) Monitoring after installation of
corrosion control and source water treatment
(A) Any large system which installs optimal
corrosion control treatment pursuant to R309-210-6(2)(d)(iv) shall monitor
during two consecutive six-month monitoring periods by the date specified in
R309-210-6(2)(d)(v).
(B) Any small
or medium-size system which installs optimal corrosion control treatment
pursuant to R309-210-6(2)(e)(v) shall monitor during two consecutive six-month
monitoring periods by the date specified in R309-210-6(2)(e)(vi).
(C) Any system which installs source water
treatment pursuant to R309-210-6(4)(b)(i)(C) shall monitor during two
consecutive six-month monitoring periods by the date specified in
R309-210-6(4)(b)(i)(D).
(iii) Monitoring after Director specifies
water quality parameter values for optimal corrosion control
After the Director specifies the values for water quality
control parameters under R309-210-6(4)(a)(vi), the system shall monitor during
each subsequent six-month monitoring period, with the first monitoring period
to begin on the date the Director specifies the optimal values under
R309-210-6(4)(a)(vi).
(iv)
Reduced monitoring
(A) A small or medium-size
water system that meets the lead and copper action levels during each of two
consecutive six-month monitoring periods may reduce the number of samples in
accordance with R309-210-6(3)(c), Table 210-3, and reduce the frequency of
sampling to once per year. A small or medium water system collecting fewer than
five samples as specified in paragraph (c) of this section, that meets the lead
and copper action levels during each of two consecutive six-month monitoring
periods may reduce the frequency of sampling to once per year. In no case can
the system reduce the number of samples required below the minimum of one
sample per available tap. This sampling shall begin during the calendar year
immediately following the end of the second consecutive six-month monitoring
period.
(B) Any water system that
meets the lead action level and maintains the range of values for the water
quality control parameters reflecting optimal corrosion control treatment
specified by the Director under R309-210-6(4)(a)(vi) during each of two
consecutive six-month monitoring periods may reduce the frequency of monitoring
to once per year and reduce the number of lead and copper samples in accordance
with paragraph (c) of this section if it receives written approval from the
Director. This sampling shall begin during the calendar year immediately
following the end of the second consecutive six-month monitoring period. The
Director shall review monitoring, treatment, and other relevant information
submitted by the water system in accordance with R309-210-6(8), and shall
notify the system in writing when it determines the system is eligible to
commence reduced monitoring pursuant to this paragraph. The Director shall
review, and where appropriate, revise its determination when the system submits
new monitoring or treatment data, or when other data relevant to the number and
frequency of tap sampling becomes available.
(C) A small or medium-size water system that
meets the lead and copper action levels during three consecutive years of
monitoring may reduce the frequency of monitoring for lead and copper from
annually to once every three years. Any water system that meets the lead action
level and maintains the range of values for the water quality control
parameters reflecting optimal corrosion control treatment specified by the
Director under R309-210-6(4)(f) during three consecutive years of monitoring
may reduce the frequency of monitoring from annually to once every three years
if it receives written approval from the Director. Samples collected once every
three years shall be collected no later than every third calendar year. The
Director shall review monitoring, treatment, and other relevant information
submitted by the water system in accordance with R309-210-6(8), and shall
notify the system in writing when it determines the system is eligible to
reduce the frequency of monitoring to once every three years. The Director
shall review, and where appropriate, revise its determination when the system
submits new monitoring or treatment data, or when other data relevant to the
number and frequency of tap sampling becomes available.
(D) A water system that reduces the number
and frequency of sampling shall collect these samples from representative sites
included in the pool of targeted sampling sites identified in R309-210-6(3)(a).
Systems sampling annually or less frequently shall conduct the lead and copper
tap sampling during the months of June, July, August or September unless the
Director has approved a different sampling period in accordance with paragraph
(d)(iv)(D)(I) of this section.
(I) The
Director, at its discretion, may approve a different period for conducting the
lead and copper tap sampling for systems collecting a reduced number of
samples. Such a period shall be no longer than four consecutive months and must
represent a time of normal operation where the highest levels of lead are most
likely to occur. For a non-transient non-community water system that does not
operate during the months of June through September, and for which the period
of normal operation where the highest levels of lead are most likely to occur
is not known, the Director shall designate a period that represents a time of
normal operation for the system. This sampling shall begin during the period
approved or designated by the State in the calendar year immediately following
the end of the second consecutive six- month monitoring period for systems
initiating annual monitoring and during the three-year period following the end
of the third consecutive calendar year of annual monitoring for systems
initiating triennial monitoring.
(II) Systems monitoring annually, that have
been collecting samples during the months of June through September and that
receive Director approval to alter their sample collection period under
paragraph (d)(iv)(D)(I) of this section, must collect their next round of
samples during a time period that ends no later than 21 months after the
previous round of sampling. Systems monitoring triennially that have been
collecting samples during the months of June through September, and receive
Director approval to alter the sampling collection period as per (d)(iv)(D)(I)
of this section, must collect their next round of samples during a time period
that ends no later than 45 months after the previous round of sampling.
Subsequent rounds of sampling must be collected annually or triennially, as
required by this section. Small systems with waivers, granted pursuant to
paragraph (g) of this section, that have been collecting samples during the
months of June through September and receive Director approval to alter their
sample collection period under paragraph (d)(iv)(D)(I) of this section must
collect their next round of samples before the end of the 9 year
period.
(E) Any water
system that demonstrates for two consecutive 6 month monitoring periods that
the tap water lead level computed under
R309-200-5(2)(c)
is less than or equal to 0.005 mg/L and the tap water copper level computed
under
R309-200-5(2)(c)
is less than or equal to 0.65 mg/L may reduce the number of samples in
accordance paragraph (c) of this section and reduce the frequency of sampling
to once every three calendar years.
(F)
(I) A
small or medium-size water system subject to reduced monitoring that exceeds
the lead or copper action level shall resume sampling in accordance
R309-210-6(3)(d)(iii) and collect the number of samples specified for standard
monitoring under R309-210-6(3)(c), Table 210-3. Such system shall also conduct
water quality parameter monitoring in accordance with R309-210-6(5)(b), (c) or
(d) (as appropriate) during the monitoring period in which it exceeded the
action level. Any such system may resume annual monitoring for lead and copper
at the tap at the reduced number of sites specified in paragraph (c) of this
section after it has completed two subsequent consecutive six month rounds of
monitoring that meet the criteria of paragraph (d)(iv)(A) of this section or
may resume triennial monitoring for lead and copper at the reduced number of
sites after it demonstrates through subsequent rounds of monitoring that it
meets the criteria of either paragraph (d)(vi)(C) or (d)(iv)(D) of this
section.
(II) Any water system
subject to the reduced monitoring frequency that fails to meet the lead action
level during any four-month monitoring period or that fails to operate at or
above the minimum value or within the range of values for the water quality
parameters specified by the Director under R309-210-6(4)(a)(vi) for more than
nine days in any six-month period specified in R309-210-6(5)(d) shall conduct
tap water sampling for lead and copper at the frequency specified in paragraph
(d)(iii) of this section, collect the number of samples specified for standard
monitoring under paragraph (c) of this section, and shall resume monitoring for
water quality parameters within the distribution system in accordance with
R309-210-6(5)(d). This standard tap water sampling shall begin no later than
the six-month period beginning January 1 of the calendar year following the
lead action level exceedance or water quality parameter excursion. Such a
system may resume reduced monitoring for lead and copper at the tap and for
water quality parameters within the distribution system under the following
conditions:
(aa) The system may resume annual
monitoring for lead and copper at the tap at the reduced number of sites
specified in paragraph (c) of this section after it has completed two
subsequent six month rounds of monitoring that meet the criteria of paragraph
(d)(iv)(B) of this section and the system has received written approval from
the Director that it is appropriate to resume reduced monitoring on an annual
frequency. This sampling shall begin during the calendar year immediately
following the end of the second consecutive six-month monitoring
period.
(bb) The system may resume
triennial monitoring for lead and copper at the tap at the reduced number of
sites after it demonstrates through subsequent rounds of monitoring that it
meets the criteria of either paragraph (d)(iv)(C) or (d)(iv)(E) of this section
and the system has received written approval from the Director that it is
appropriate to resume triennial monitoring.
(cc) The system may reduce the number of
water quality parameter tap water samples required in accordance with
R309-210-6(5)(e)(i) and the frequency with which it collects such samples in
accordance with R309-210-6(5)(e)(ii). Such a system may not resume triennial
monitoring for water quality parameters at the tap until it demonstrates, in
accordance with the requirements of R309-210-6(5)(e)(ii), that it has
requalified for triennial monitoring.
(G) Any water system subject to a reduced
monitoring frequency under paragraph (d)(iv) of this section shall notify the
Director in writing in accordance with R309-210-6(8)(a)(iii) of any upcoming
long-term change in treatment or addition of a new source as described in that
section. The Director must review and approve the addition of a new source or
long-term change in water treatment before it is implemented by the water
system. The Director may require the system to resume sampling in accordance
with paragraph (d)(iii) of this section and collect the number of samples
specified for standard monitoring under paragraph (c) of this section or take
other appropriate steps such as increased water quality parameter monitoring or
re-evaluation of its corrosion control treatment given the potentially
different water quality considerations.
(f)
Invalidation of lead or copper tap water samples. A sample invalidated under
this paragraph does not count toward determining lead or copper 90th percentile
levels under Sec. 141.80 (c) (3) or toward meeting the minimum monitoring
requirements of paragraph (c) of this section.
(i) The Director may invalidate a lead or
copper tap water sample at least if one of the following conditions is met.
(A) The laboratory establishes that improper
sample analysis caused erroneous results.
(B) The Director determines that the sample
was taken from a site that did not meet the site selection criteria of this
section.
(C) The sample container
was damaged in transit.
(D) There
is substantial reason to believe that the sample was subject to
tampering.
(ii) The
system must report the results of all samples to the Director and all
supporting documentation for samples the system believes should be
invalidated.
(iii) To invalidate a
sample under paragraph (f)(i) of this section, the decision and the rationale
for the decision must be documented in writing. The Director may not invalidate
a sample solely on the grounds that a follow-up sample result is higher or
lower than that of the original sample.
(iv) The water system must collect
replacement samples for any samples invalidated under this section if, after
the invalidation of one or more samples, the system has too few samples to meet
the minimum requirements of paragraph (c) of this section. Any such replacement
samples must be taken as soon as possible, but no later than 20 days after the
date the Director invalidates the sample or by the end of the applicable
monitoring period, whichever occurs later. Replacement samples taken after the
end of the applicable monitoring period shall not also be used to meet the
monitoring requirements of a subsequent monitoring period. The replacement
samples shall be taken at the same locations as the invalidated samples or, if
that is not possible, at locations other than those already used for sampling
during the monitoring period.
(g) Monitoring waivers for small systems. Any
small system that meets the criteria of this paragraph may apply to the
Director to reduce the frequency of monitoring for lead and copper under this
section to once every nine years (i.e., a full waiver) if it meets all of the
materials criteria specified in paragraph (g)(i) of this section and all of the
monitoring criteria specified in paragraph (g) (ii) of this section. Any small
system that meets the criteria in paragraphs (g) (i) and (ii) of this section
only for lead, or only for copper, may apply to the Director for a waiver to
reduce the frequency of tap water monitoring to once ever nine years for that
contaminant only (i.e., a partial waiver).
(i) Materials criteria. The system must
demonstrate that its distribution system and service lines and all drinking
water supply plumbing, including plumbing conveying drinking water within all
residences and buildings connected to the system, are free of lead-containing
materials and/or copper-containing materials, as those terms are defined in
this paragraph, as follows:
(A) Lead. To
qualify for a full waiver, or a waiver of the tap water monitoring requirements
for lead (i.e., a lead waiver), the water system must provide certification and
supporting documentation to the Director that the system is free of all
lead-containing materials, as follows:
(I) It
contains no plastic pipes which contain lead plasticizers, or plastic service
lines which contain lead plasticizers; and
(II) It is free of lead service lines, lead
pipes, lead soldered pipe joints, and leaded brass or bronze alloy fittings and
fixtures, unless such fittings and fixtures meet the specifications of any
standard established pursuant to
42 U.S.C.
300 g - 6(e) (SDWA section 1417
(e)).
(B) Copper. To
qualify for a full waiver, or waiver of the tap water monitoring requirements
for copper (i.e., a copper waiver), the water system must provide certification
and supporting documentation to the Director that the system contains no copper
pipes or copper service lines.
(ii) Monitoring criteria for waiver issuance.
The system must have completed at least one 6-month round of standard tap water
monitoring for lead and copper at sites approved by the Director and from the
number of sites required by paragraph (c) of this section and demonstrate that
the 90th percentile levels for any and all rounds of monitoring conducted since
the system became free of all lead-containing and/or copper-containing
materials, as appropriate, meet the following criteria.
(A) Lead levels. To qualify for a full
waiver, or a lead waiver, the system must demonstrate that the 90th percentile
lead level does not exceed 0.005 mg/L.
(B) Copper levels. To qualify for a full
waiver, or a copper waiver, the system must demonstrate that the 90th
percentile lead level does not exceed 0.65 mg/L.
(iii) Director approval of waiver
application. The Director shall notify the system of its waiver determination,
in writing, setting forth the basis of its decision and any condition of the
waiver. As a condition of the waiver, the Director may require the system to
perform specific activities (e.g., limited monitoring, periodic outreach to
customers to remind them to avoid installation of materials that might void the
waiver) to avoid the risk of lead or copper concentration of concern in tap
water. The small system must continue monitoring for lead and copper at the tap
as required by paragraphs (d) (i) through (d) (iv) of this section, as
appropriate, until it receives written notification from the Director the
waiver has been approved.
(iv)
Monitoring frequency for systems with waivers.
(A) A system with a full waiver must conduct
tap water monitoring for lead and copper in accordance with paragraph
(d)(iv)(D) of this section at the reduced number of sampling sites identified
in paragraph (c) of this section at least once every nine years and provide the
materials certification specified in paragraph (g)(i) of this section for both
lead and copper to the Director along with the monitoring results. Samples
collected every nine years shall be collected no later than every ninth
calendar year.
(B) A system with a
partial waiver must conduct tap water monitoring for the waived contaminant in
accordance with paragraph (d)(iv)(D) of this section at the reduced number of
sampling sites specified in paragraph (c) of this section at least once every
nine years and provide the materials certification specified in paragraph
(g)(i) of this section pertaining to the waived contaminant along with the
monitoring results. Such a system also must continue to monitor for the
non-waived contaminant in accordance with requirements of paragraph (d)(i)
through (d)(iv) of this section, as appropriate.
(C) Any water system with a full or partial
waiver shall notify the Director in writing in accordance with
R309-210-6(8)(a)(iii) of any upcoming long-term change in treatment or addition
of a new source, as described in that section. The Director must review and
approve the addition of a new source or long-term change in water treatment
before it is implemented by the water system. The Director has the authority to
require the system to add or modify waiver conditions (e.g., require
recertification that the system is free of lead-containing and/or
copper-containing materials, require additional round(s) of monitoring), if it
deems such modifications are necessary to address treatment or source water
changes at the system.
(D) If a
system with a full or partial waiver because aware that it is no longer free of
lead- containing or copper-containing materials, as appropriate, (e.g., as a
result of new construction or repairs), the system shall notify the Director in
writing no later than 60 days after becoming aware of such a change.
(v) Continued eligibility. If the
system continues to satisfy the requirements of paragraph (g) (iv) of this
section, the waiver will be renewed automatically, unless any of the conditions
listed in paragraph (g)(v)(A) through (g)(v)(C) of this section occurs. A
system whose waiver has been revoked may re-apply for a waiver at such time as
it again meets the appropriate materials and monitoring criteria of paragraphs
(g)(i) and (g)(ii) of this section.
(A) A
system with a full waiver or lead waiver no longer satisfies the materials
criteria of paragraph (g)(i)(A) of this section or has a 90th percentile lead
level greater than 0.005 mg/L.
(B)
A system with a full waiver or a copper waiver no longer satisfies the
materials criteria of paragraph (g)(i)(B) of this section or has a 90th
percentile copper level greater than 0.65 mg/L.
(C) The Director notifies the system, in
writing, that the waiver has been revoked, setting forth the basis of its
decision.
(vi)
Requirements following waiver revocation. A system whose full or partial waiver
has been revoked by the Director is subject to the corrosion control treatment
and lead and copper tap water monitoring requirements, as follows:
(A) If the system exceeds the lead and/or
copper action level, the system must implement corrosion control treatment in
accordance with the deadlines specified in R309-210-6(2)(e), and any other
applicable requirements of this subpart.
(B) If the system meets both the lead and the
copper action level, the system must monitor for lead and copper at the tap no
less frequently than once every three years using the reduced number of sample
sites specified in paragraph (c) of this section.
(vii) Pre-existing waivers. Small system
waivers approved by the Director in writing prior to April 11, 2000 shall
remain in effect under the following conditions:
(A) If the system has demonstrated that it is
both free of lead-containing and copper- containing materials, as required by
paragraph (g)(i) of this section and that its 90th percentile lead levels and
90th percentile copper levels meet the criteria of paragraph (g)(ii) of this
section, the waiver remains in effect so long as the system continues to meet
the waiver eligibility criteria of paragraph (g)(v) of this section. The first
round of tap water monitoring conducted pursuant to paragraph (g)(iv) of this
section shall be completed no later than nine years after the last time the
system has monitored for lead and copper at the tap.
(B) If the system has met the materials
criteria of paragraph (g)(i) of this section but has not met the monitoring
criteria of paragraph (g)(ii) of this section, the system shall conduct a round
of monitoring for lead and copper at the tap demonstrating that it meets the
criteria of paragraph (g)(ii) of this section no later than September 30, 2000.
Thereafter, the waiver shall remain in effect as long as the system meets the
continued eligibility criteria of paragraph (g)(v) of this section. The first
round of tap water monitoring conducted pursuant to paragraph (g)(iv) of this
section shall be completed no later than nine years after the round of
monitoring conducted pursuant to paragraph (g)(ii) of this section.