This rule applies to all surface water
systems and consecutive water systems receiving water from a surface water
source. Seasonal systems shall monitor in accordance with this rule during the
system's operating season.
(A)
Surface water systems.
(1)
Cyanobacteria
screening.
Surface water systems shall monitor
with a minimum of one sample from each raw water sampling point at least once
every two weeks for cyanobacteria screening. Cyanobacteria samples shall be
collected at the same time as the routine microcystins sample.
(2)
Routine microcystins monitoring.
(a)
Routine microcystins monitoring requirements between
May first and October thirty-first.
Surface water systems shall monitor
with a minimum of one sample from each raw water sampling point and one sample
from each finished water sampling point at least weekly for microcystins
analysis.
(b)
Routine microcystins monitoring requirements between
November 1 and April 30.
(i)
Surface water systems shall continue to monitor in
accordance with paragraph (A)(2)(a) of this rule unless microcystins are not
detected in at least two consecutive weekly samples from both the raw water
sampling point and the finished water sampling point, then the microcystins
monitoring frequency is reduced to a minimum of one sample from each raw water
sampling point at least once every two weeks.
(ii)
If microcystins
are detected at a raw water sampling point, weekly monitoring at that raw water
sampling point and the finished water sampling point shall be conducted
beginning no later than twenty-four hours following the detection. When
microcystins are not detected in at least two consecutive weekly samples from
both the raw water sampling point and the finished water sampling point, then
monitoring once every two weeks may resume in accordance with paragraph
(A)(2)(b)(i) of this rule.
(c)
Increased
routine microcystin monitoring (three days per week).
The frequency of monitoring at both raw
water sampling points and finished water sampling points shall be increased to
three days a week, beginning no later than the following week, if microcystins
exceed five micrograms per liter (ug/L) at the raw water sampling point, unless
an alternate frequency has been established as part of the approved cyanotoxin
general plan in accordance with rule
3745-90-05
of the Administrative Code.
Routine monitoring in accordance with
paragraphs (A)(2)(a) and (A)(2)(b) of this rule may resume once the following
occur:
(i)
Microcystins concentrations are equal to or less than
five ug/L in two consecutive samples from the raw water sampling point that are
collected at least one day apart.
(ii)
Microcystins
concentration is non-detect at finished water sampling points.
(iii)
If samples
were collected at distribution sampling points in accordance with this rule,
microcystins are not detected at any distribution sampling
point.
(d)
Increased routine microcystins monitoring
(daily).
The frequency of monitoring at both raw
water sampling points and finished water sampling points shall be increased to
daily if microcystins are detected at finished water sampling points collected
in accordance with this rule, or distribution sampling points collected in
accordance with this rule. Daily monitoring shall include analysis within
twenty-four hours of sample collection.
Routine monitoring may resume in
accordance with paragraphs (A)(2)(a) and (A)(2)(b) of this rule if the two most
recent consecutive daily samples from the raw water sampling point are equal to
or less than five ug/L, or in accordance with paragraph (A)(2)(c) of this rule
if either of the two most recent consecutive daily samples from the raw water
sampling point are greater than five ug/L, once the following
occur:
(i)
Microcystins are not detected in two consecutive daily
samples collected at the finished water sampling point.
(ii)
If samples were
collected at distribution sampling points in accordance with this rule,
microcystins are below the action level at distribution sampling
points.
(3)
Revised
cyanobacteria screening or routine microcystins monitoring frequency.
The cyanobacteria screening or routine
microcystins monitoring frequency may be revised (decreased, increased or
discontinued) at the discretion of the director. When establishing the revised
schedule, the director may consider cyanobacteria screening data collected in
accordance with this rule, microcystins data, and other information provided by
the public water system including data from other screening tools (such as
phycocyanin sensors or phytoplankton enumeration) and treatment information.
Surface water systems shall monitor in accordance with the revised
cyanobacteria screening or routine microcystins monitoring schedule established
by the director.
(4)
Response to microcystins action level
exceedance.
If microcystins exceed an action level
established in paragraph (A)(1) or (A)(2) of rule
3745-90-02
of the Administrative Code in routine samples collected at the finished water
sampling point, the public water system shall do the following:
(a)
As soon as
possible, but no later than twenty-four hours after receiving the results of
the initial action level exceedance, collect one resample from each raw water
sampling point and one resample from each finished water sampling point.
Analysis of resamples must be completed within twenty-four hours of collection.
These resamples satisfy the requirement for daily samples as set forth in
paragraph (A)(2)(d) of this rule.
(b)
Within
twenty-four hours of collecting the resamples, collect one repeat sample from
each raw water sampling point and one repeat sample from each finished water
sampling point. Analysis of repeat samples must be completed within twenty-four
hours of collection. These repeat samples satisfy the requirement for daily
samples as set forth in paragraph (A)(2)(d) of this rule.
(c)
If the
microcystins concentration exceeds the action level in the resample or repeat
sample collected at any finished water sampling point in accordance with
paragraph (A)(4)(a) or (A)(4)(b) of this rule, as soon as practical but no
later than three hours after receiving the resample or repeat sample results,
the surface water system shall notify all consecutive systems served by the
water system. The surface water system with the action level exceedance, and
all consecutive water systems served by the water system, shall within
twenty-four hours of receiving the resample or repeat sample results, collect
samples at representative distribution sampling points in accordance with the
contingency plan required by rule
3745-85-01 of
the Administrative Code. Additional distribution system monitoring may be
required by the director based on sampling results and other relevant
circumstances. Analysis of distribution samples must be completed within
twenty-four hours of collection.
(d)
Conduct routine
daily monitoring in accordance with paragraph (A)(2)(d) of this
rule.
(B)
Consecutive
water systems receiving water from an in-state surface water system.
Within twenty-four hours of receiving
notification of an action level exceedance in accordance with paragraph
(A)(4)(c) or (C)(2)(c) of this rule, the consecutive water system shall collect
samples at representative distribution sampling points in accordance with the
contingency plan required by rule
3745-85-01 of
the Administrative Code. Additional distribution system monitoring may be
required by the director based on sampling results and other relevant
circumstances. Analysis of distribution samples must be completed within
twenty-four hours of collection.
(C)
Consecutive
water systems receiving water from an out-of-state surface water source.
(1)
Routine
microcystins monitoring.
(a)
Routine microcystins monitoring requirements between
May first and October thirty-first.
Consecutive water systems receiving
water from an out-of-state surface water source shall monitor with a minimum of
one sample from each finished water sampling point at least weekly for
microcystins analysis.
(b)
Routine
microcystins monitoring requirements between November first and April
thirtieth.
Consecutive water systems receiving
water from an out-of-state surface water source shall monitor with a minimum of
one sample from each finished water sampling point at least once every two
weeks for microcystins analysis.
(c)
Increased
routine microcystins monitoring (daily).
The frequency of monitoring at finished
water sampling points shall be increased to daily if microcystins are detected
at finished water sampling points collected in accordance with this rule, or
distribution sampling points collected in accordance with this rule. Daily
monitoring shall include analysis within twenty-four hours of sample
collection.
Routine monitoring may resume in
accordance with paragraph (C)(1)(a) or (C)(1)(b) of this rule once the
following occur:
(i)
Microcystins are not detected in two consecutive daily
samples collected at the finished water sampling point.
(ii)
If samples were
collected at distribution sampling points in accordance with this rule,
microcystins are below the action level at distribution sampling
points.
(d)
Revised routine microcystins monitoring
frequency.
The routine microcystins monitoring
frequency may be revised (decreased, increased or discontinued) at the
discretion of the director. When establishing the revised schedule, the
director may consider microcystins data, and other information provided by the
public water system including data from screening tools (such as phycocyanin
sensors or phytoplankton enumeration) and treatment information. Consecutive
water systems shall monitor in accordance with the revised routine microcystins
monitoring schedule established by the director.
(2)
Response to microcystins action level exceedance.
If microcystins exceed an action level
established in paragraph (A)(1) or (A)(2) of rule
3745-90-02
of the Administrative Code in routine samples collected at the finished water
sampling point, the public water system shall do the following:
(a)
As soon as
possible, but no later than twenty-four hours after receiving the results of
the initial action level exceedance, collect one resample from each finished
water sampling point. Analysis of resamples must be completed within
twenty-four hours of collection. This resample satisfies the requirement for
daily samples as set forth in paragraph (C)(1)(c) of this rule.
(b)
Within
twenty-four hours of collecting the resamples, collect one repeat sample from
each finished water sampling point. Analysis of repeat samples must be
completed within twenty-four hours of collection. This repeat sample satisfies
the requirement for daily samples as set forth in paragraph (C)(1)(c) of this
rule.
(c)
If the microcystins concentration exceeds the action
level in the resample or repeat sample collected at any finished water sampling
point in accordance with paragraph (C)(2)(a) or (C)(2)(b) of this rule, as soon
as practical but no later than three hours after receiving the resample or
repeat sample results, the public water system shall notify all consecutive
systems served by the water system. The public water system with the action
level exceedance, and all consecutive water systems served by the water system,
shall within twenty-four hours of receiving the resample or repeat sample
results, collect samples at representative distribution sampling points in
accordance with the contingency plan required by rule
3745-85-01 of
the Administrative Code. Additional distribution system monitoring may be
required by the director based on sampling results and other relevant
circumstances. Analysis of distribution samples must be completed within
twenty-four hours of collection.
(d)
Conduct routine
daily monitoring in accordance with paragraph (C)(1)(c) of this
rule.
(D)
Monitoring
extension.
Upon a request from a public water
system, the director may agree to extend the twenty-four hour monitoring
requirement for daily, resample, repeat or distribution samples required
pursuant to this rule on a case-by-case basis when the public water system has
a logistical problem collecting samples within twenty-four hours or analyzing
samples in accordance with the requirements of this chapter. When an extension
is agreed to by the director, the director shall specify in writing how much
time the public water system has to monitor. Examples of potential logistical
problems include, but are not limited to:
(1)
Extreme weather
conditions create unsafe travel or on-site conditions for the person collecting
the sample.
(2)
Limited certified laboratory capacity on weekends and
holidays.
(E)
Violations.
Failure to comply with routine and
distribution monitoring requirements in paragraph (A)(1), (A)(2), (A)(3),
(A)(4)(c), (B), (C)(1) or (C)(2)(c) of this rule is a monitoring violation and
requires the public water system to provide Tier 3 public notification in
accordance with rule
3745-81-32 of
the Administrative Code. Failure to comply with resample and repeat sample
requirements in paragraph (A)(4)(a), (A)(4)(b), (C)(2)(a) or (C)(2)(b) of this
rule is a monitoring violation and requires the public water system to provide
a tier 1 public notification accordance with rule
3745-81-32 of
the Administrative Code.
Notes
Ohio Admin. Code
3745-90-03
Effective:
6/1/2016
Five Year Review (FYR) Dates:
06/01/2021
Promulgated
Under: 119.03
Statutory
Authority: 3745.50,
6109.04
Rule
Amplifies: 3745.50,
6109.04
