All large public water systems shall monitor water quality
parameters in addition to lead and copper in accordance with this rule. All
small and medium public water systems that exceed the lead or copper action
level shall monitor water quality parameters in addition to lead and copper in
accordance with this rule. For performing the analyses of water quality
parameters set forth in this rule, laboratories are exempt from the
requirements of rule
3745-89-02
of the Administrative Code. The requirements of this rule are summarized in the
table at the end of this rule.
(A)
General requirements.
(1) Sample collection
methods.
(a) Tap samples shall be
representative of water quality throughout the distribution system taking into
account the number of persons served, the different sources of water, the
different treatment methods employed by the public water system, and seasonal
variability. Tap sampling under this rule is not required to be conducted at
taps targeted for lead and copper sampling under paragraph (A) of rule
3745-81-86
of the Administrative Code.
(b)
Samples collected at the entry
point(s)
points to the distribution system shall be from
locations representative of each water source after treatment. If a public
water system draws water from more than one water source and the sources are
combined before distribution, the system shall monitor at each sampling point
during periods of normal operating conditions, that is, when water is
representative of all sources being used.
(2) Number of samples.
(a) Public water systems shall collect two
tap samples for applicable water quality parameters during each monitoring
period specified under paragraphs (B) to (E) of this rule from the following
number of sites.
|
System size (number of people served)
|
Number of sites for water quality parameters
|
|
> 100,000
|
25
|
|
10,001 - 100,000
|
10
|
|
3,301 - 10,000
|
3
|
|
501 - 3,300
|
2
|
|
101 - 500
|
1
|
|
< 101
|
1
|
(b)
Except as provided in paragraph (C)(3) of this rule, public water systems shall
collect two samples for each applicable water quality parameter at each entry
point to the distribution system during each monitoring period specified in
paragraph (B) of this rule. During each monitoring period specified in
paragraphs (C) to (E) of this rule, systems shall collect one sample for each
applicable water quality parameter at each entry point to the distribution
system.
(B)
Initial sampling. All large public water systems shall measure the applicable
water quality parameters as specified below at taps and at each entry point to
the distribution system during each six-month period specified in paragraph
(D)(1) of rule
3745-81-86
of the Administrative Code. All small and medium public water systems shall
measure the applicable water quality parameters at the locations specified
below during each six month monitoring period specified in paragraph (D)(1) of
rule
3745-81-86
of the Administrative Code during which the system exceeds the lead or copper
action level.
(1) At taps, measure the
following:
(a) pH.
(b) Alkalinity.
(c) Orthophosphate, when an inhibitor
containing a phosphate compound is used.
(d) Silica, when an inhibitor containing a
silicate compound is used.
(e)
Calcium.
(f)
Conductivity.
(g) Water
temperature.
(2) At each
entry point to the distribution system: all of the applicable parameters listed
in paragraph (B)(1) of this rule.
(C) Monitoring after installation of
corrosion control. Any large public water system which installs optimal
corrosion control treatment pursuant to paragraph (D)(4) of rule
3745-81-81
of the Administrative Code shall measure the water quality parameters at the
locations and frequencies specified in paragraphs (C)(1) and (C) (2) of this
rule during each six-month monitoring period specified in paragraph (D) (2)(a)
of rule
3745-81-86
of the Administrative Code. Any small or medium public water system which
installs optimal corrosion control treatment shall conduct water quality
parameter monitoring specified in paragraphs (C)(1) and (C)(2) of this rule
during each six-month monitoring period specified in paragraph (D)(2)(b) of
rule
3745-81-86
of the Administrative Code.
(1) At taps, two
samples for the following:
(a) pH.
(b) Alkalinity.
(c) Orthophosphate, when an inhibitor
containing a phosphate compound is used.
(d) Silica, when an inhibitor containing a
silicate compound is used.
(e)
Calcium, when calcium carbonate stabilization is used as part of corrosion
control.
(2) Except as
provided in paragraph (C)(3) of this rule, at each entry point to the
distribution system, at least one sample no less frequently than every two
weeks for the following:
(a) pH.
(b) Alkalinity concentration when alkalinity
is adjusted as part of optimal corrosion control. A reading of the dosage rate
of the chemical used to adjust alkalinity shall also be included.
(c) The concentration of orthophosphate or
silica, whichever is applicable, when a corrosion inhibitor is used as part of
optimal corrosion control. A reading of the dosage rate of the inhibitor used
shall also be included.
(3) Any ground water system can limit entry
point sampling described in paragrap h(C)(2) of this rule to those entry points
that are representative of water quality and treatment conditions throughout
the system. If water from untreated ground water sources mixes with water from
treated water sources, the public water system shall monitor for water quality
parameters both at representative entry points receiving treatment and
representative entry points receiving no treatment. Prior to the start of
monitoring under this paragraph, the public water system shall provide to the
director written information on seasonal variability, sufficient to demonstrate
that the sites are representative of water quality and treatment conditions
throughout the system.
(D) Monitoring after the director specifies
water quality parameter values for optimal corrosion control. After the
director specifies the values for applicable water quality control parameters
reflecting optimal corrosion control treatment under paragraph (F) of rule
3745-81-82
of the Administrative Code, all large public water systems shall measure the
applicable water quality parameters in accordance with paragraph (C) of this
rule and determine compliance with the requirements of paragraph (G) of rule
3745-81-82
of the Administrative Code for every six-month period to begin on either
January first or July first, whichever comes first, after the director
specifies the optimal values under paragraph (F) of rule
3745-81-82
of the Administrative Code.
Any small or medium public water system shall conduct such
monitoring during each six-month period specified in this paragraph. For any
such small or medium public water system that is subject to a reduced
monitoring frequency pursuant to paragraph (D)(4) of rule
3745-81-86
of the Administrative Code, at the time of the action level exceedance, the
start of the applicable six-month period under this paragraph shall coincide
with the start of the applicable monitoring period under paragraph (D)(4) of
rule
3745-81-86
of the Administrative Code. Compliance with director-designated optimal water
quality parameter values shall be determined as specified under paragraph (G)
of rule
3745-81-82
of the Administrative Code.
Upon the determination of an action
level exceedance, any public water system that is subject to a reduced
monitoring frequency pursuant to paragraph (D)(4) of rule
3745-81-86
of the Administrative Code shall report applicable water quality parameters in
accordance with this rule within thirty days or by the end of the water quality
parameter monitoring period, whichever is sooner.
(E) Reduced monitoring.
(1) Any public water system that maintains
the range of values for the water quality parameters reflecting optimal
corrosion control treatment during each of two consecutive six-month monitoring
periods under paragraph (D) of this rule shall continue monitoring at the entry
points to the distribution system as specified in paragraph (C)(2) of this
rule. Such system may monitor with two tap samples for applicable water quality
parameters from each of the following reduced number of sites during each
six-month monitoring period.
A water system monitoring
from a reduced number of sites prior to the effective date of this rule may
continue with the reduced number of monitoring sites except as modified by
paragraph (E)(5) of this rule.
|
System size (number of people served)
|
Reduced number of sites for water quality
parameters
|
|
> 100,000
|
10
|
|
10,001 - 100,000
|
7
|
|
3,301 - 10,000
|
3
|
|
501 - 3,300
|
2
|
|
101 - 500
|
1
|
|
< 101
|
1
|
(2)
Reduced
frequency of
annual water quality parameter monitoring.
In order to reduce the monitoring frequency to annual
monitoring of the number of tap samples for applicable water quality
parameters, the water system shall submit a request to the director for
approval. This request shall demonstrate the system maintains the ranges of
values for the water quality parameters reflecting optimal corrosion control
treatment specified by the director under paragraph (F) of rule
3745-81-82
of the Administrative Code during three consecutive years of monitoring. If
approved by the director, this sampling begins during the calendar year
immediately following the end of the monitoring period in which the third
consecutive year of six-month monitoring occurs.
(a)
(3)
Any public water system that maintains the range of
values for the water quality parameters reflecting optimal corrosion control
treatment specified by the director under paragraph (F) of rule
3745-81-82
of the Administrative Code during three consecutive years of monitoring may
reduce the frequency with which it monitors
Reduced triennial water quality parameter monitoring. As of
the effective date of this rule, no water systems are eligible to continue to
conduct or reduce to triennial monitoring of the number of tap samples
for applicable water quality parameters specified in paragraph (E)(1) of this
rule
from every six months
without meeting criteria in paragraph (E)(3)(a) or (E)(3)(b)
of this rule and receiving written approval from the director.
to annually. This sampling begins during the
calendar year immediately following the end of the monitoring period in which
the third consecutive year of six-month monitoring occurs. Any
public water
system
systems that
maintains the range of values for the water quality
parameters reflecting optimal corrosion control treatment specified
by
did not receive approval from the
director
under paragraph (F) of rule
3745-81-82
of the Administrative Code during three consecutive years of
annual
and were conducting triennial
monitoring
may reduce the frequency with which it
monitors the number of tap samples for applicable
prior to the effective date of this rule, shall
conduct water quality
parameters specified in
paragraph (E)(1) of this rule from
parameter
monitoring, at a minimum, annually
to every
three years.
This sampling begins no later
than the third calendar year following the end of the monitoring period in
which the third consecutive year of monitoring occurs.
(a)
In order to
conduct triennial monitoring of the number of tap samples for applicable water
quality parameters, the water system shall demonstrate the system maintains the
range of values for the water quality parameters reflecting optimal corrosion
control treatment specified by the director under paragraph (F) of rule
3745-81-82
of the Administrative Code during three consecutive years of annual monitoring.
If approved by the director, this sampling begins no later than the third
calendar year following the end of the monitoring period in which the third
consecutive year of monitoring occurs.
(b)
A public water
system may reduce the frequency with which it collects
In
order to conduct triennial monitoring of the number of tap samples for
applicable water quality parameters specified in paragraph (E)(1) of this rule
to every three years if it demonstrates
, the water system shall demonstrate during two
consecutive monitoring periods that its tap water lead level at the ninetieth
percentile is less than or equal to the practical quantitation limit (PQL) for
lead specified in paragraph (B)(2) of rule
3745-81-89 of
the Administrative Code, that its tap water copper level at the ninetieth
percentile is less than or equal to 0.65 milligrams per liter in paragraph
(C)(2) of rule
3745-81-80
of the Administrative Code, and that it has maintained the range of values for
the water quality parameters reflecting optimal corrosion control treatment
specified by the director under paragraph (F) of rule
3745-81-82
of the Administrative Code.
Monitoring conducted
every three years
If approved by the director,
triennial monitoring shall be done no later than every third calendar
year.
(3)
(4) A public water system that conducts monitoring
annually shall collect samples evenly throughout the year so as to reflect
seasonal variability.
(4)
(5) Any public water system subject to
reduced
annual or
triennial monitoring
frequency 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 paragraph (F)
of rule
3745-81-82
of the Administrative Code for more than nine days in any six-month period
specified in paragraph (G) of rule
3745-81-82
of the Administrative Code shall resume tap water sampling in accordance with
the number and frequency requirements in paragraph (D) of this rule. Such a
system may resume annual monitoring for water quality parameters at the tap at
the reduced number of sites specified in paragraph (E)(1) of this rule after it
has completed two subsequent consecutive six-month rounds of monitoring that
meet the criteria of that paragraph or may resume triennial monitoring for
water quality parameters 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
(E)(2)(a)
(E)(2) or
(E)(2)(b)
(E)(3) of
this rule.
(F) Additional
monitoring by public water systems. The results of any monitoring conducted in
addition to the minimum requirements of this rule shall be considered by the
system and the director in making any determinations, i.e., determining
concentrations of water quality parameters, under this rule or rule
3745-81-82
of the Administrative Code.
Summary of Monitoring Requirements for Water Quality Parameters
1
|
Monitoring Period
|
Parameters
|
Location
|
Frequency
|
|
Initial monitoring.
|
pH, alkalinity, orthophosphate or
silica2, calcium, conductivity, temperature.
|
Taps and at entry point(s) to distribution
system.
|
Every 6 months.
|
|
After installation of corrosion control.
|
pH, alkalinity, orthophosphate or
silica2, calcium3.
|
Taps.
|
Every 6 months.
|
|
pH, alkalinity dosage rate and concentration (if
alkalinity adjusted as part of corrosion control), inhibitor dosage
rate4 and orthophosphate or
silica2.
|
Entry point(s) to distribution
system5.
|
No less frequently than every two weeks.
|
|
After director specifies parameter values for optimal
corrosion control.
|
pH, alkalinity, orthophosphate or
silica2, calcium3.
|
Taps.
|
Every 6 months.
|
|
pH, alkalinity dosage rate and concentration (if
alkalinity adjusted as part of corrosion control), inhibitor dosage
rate4 and orthophosphate or
silica2.
|
Entry point(s) to distribution
system5.
|
No less frequently than every two weeks.
|
|
Reduced monitoring.
|
pH, alkalinity, orthophophate or
silica2, calcium3.
|
Taps.
|
Every 6 months, annually6 or
every 3 years7; reduced number of sites.
|
|
pH, alkalinity dosage rate and concentration (if
alkalinity adjusted as part of corrosion control), inhibitor dosage
rate4 and orthophosphate or
silica2.
|
Entry point(s) to distribution
system5.
|
No less frequently than every two weeks.
|
1 Table is for illustrative
purposes; consult the text of this rule for precise regulatory
requirements.
2 Orthophosphate shall be measured
only when an inhibitor containing a phosphate compound is used. Silica shall be
measured only when an inhibitor containing silicate compound is used.
3 Calcium shall be measured only
when calcium carbonate stabilization is used as part of corrosion
control.
4 Inhibitor dosage rates
(orthophosphate or silica) shall be measured only when an inhibitor is
used.
5 Ground water systems may limit
monitoring to representative locations throughout the public water
system.
6 Water systems may reduce frequency
of monitoring for water quality parameters at the tap from every six months to
annually if they have maintained the range of values
for water quality parameters reflecting optimal corrosion control during the
three consecutive years of monitoring
the
system meets the requirements in paragraph (E)(2) of this rule.
7 Water systems may further reduce
the frequency of monitoring for water quality parameters at the tap from
annually to once every three years if they have
maintained the range of values for water quality parameters reflecting optimal
corrosion control during three consecutive years of annual monitoring. Water
systems may accelerate to triennial monitoring for water quality parameters at
the tap if they have maintained ninetieth percentile lead levels less than or
equal to 0.005 milligrams per liter, ninetieth percentile copper lead levels
less than or equal to 0.65 milligrams per liter, and the range of water quality
parameters designated by the director under paragraph (F) of rule
3745-81-82
of the Administrative Code as representing optimal corrosion control during two
consecutive six-month monitoring periods
the
system meets the requirements in paragraph (E)(2) or (E)(3) of this
rule.
Notes
Ohio Admin. Code
3745-81-87
Five Year Review (FYR) Dates:
1/24/2023 and
01/24/2028
Promulgated
Under: 119.03
Statutory
Authority: 6109.121,
6109.04
Rule
Amplifies: 6109.121,
6109.04
Prior
Effective Dates: 09/13/1993, 10/17/2003, 07/24/2009, 02/23/2015,
05/01/2018
Effective: 5/1/2018
Five Year Review
(FYR) Dates: 1/31/2018 and
05/01/2023
Promulgated
Under: 119.03
Statutory
Authority: 6109.121,
6109.04
Rule
Amplifies: 6109.04,
6109.121
Prior
Effective Dates: 9/13/93, 10/17/03, 7/24/09,
2/23/15
