Current through August 26, 2024
(1) CORROSION CONTROL TREATMENT REQUIREMENTS.
Water suppliers shall complete the applicable corrosion control treatment
requirements described in s. NR 809.543 by the deadlines established.
(a) The water supplier for a large system
shall complete the corrosion control treatment steps specified in sub. (4),
unless the public water system is deemed to have optimized corrosion control
under sub. (2) (b) or (c).
(b) The
water supplier for a small system and a medium-size system shall complete the
corrosion control treatment steps specified in sub. (5), unless the public
water system is deemed to have optimized corrosion control under sub. (2) (a),
(b) or (c).
(2)
DETERMINATION OF OPTIMUM CORROSION CONTROL. A public water system is deemed to
have optimized corrosion control and is not required to complete the applicable
corrosion control treatment steps identified in this section if the public
water system satisfies one of the criteria specified in pars. (a) to (c). Any
public water system deemed to have optimized corrosion control under this
subsection, and which has treatment in place, shall continue to operate and
maintain optimal corrosion control treatment and meet any requirements that the
department determines appropriate to ensure optimal corrosion control treatment
is maintained.
(a) A small or medium-size
water system is deemed to have optimized corrosion control if the public water
system meets the lead and copper action levels during each of 2 consecutive
6-month monitoring periods conducted in accordance with s. NR 809.547.
(b) Any public water
system may be deemed by the department to have optimized corrosion control
treatment if the water supplier demonstrates to the satisfaction of the
department that they have conducted activities equivalent to the corrosion
control steps applicable to the public water systems under this section. If the
department makes this determination, it shall provide the water supplier with
written notice explaining the basis for its decision and shall specify the
water quality control parameters representing optimal corrosion control in
accordance with s. NR 809.543 (6). Public water systems deemed to have
optimized corrosion control under this paragraph shall operate in compliance
with the department-designated optimal water quality control parameters in
accordance with s. NR 809.543 (8) and continue to conduct lead and copper tap
and water quality parameter sampling in accordance with ss. NR 809.547 (4) (c)
and 809.548 (4), respectively. A water supplier shall provide the department
with all of the following information in order to support a determination under
this subsection:
1. The results of all test
samples collected for each of the water quality parameters in s. NR 809.543 (3)
(c).
2. A report explaining the
test methods used by the water supplier to evaluate the corrosion control
treatments listed in s. NR 809.543 (3) (a), the results of all tests conducted,
and the basis for the water supplier's selection of optimal corrosion control
treatment.
3. A report explaining
how corrosion control has been installed and how it is being maintained to
insure minimal lead and copper concentrations at consumers' taps.
4. The results of tap water samples collected
in accordance with s. NR 809.547 at least once every 6 months for one year
after corrosion control has been installed.
(c) Any public water system is deemed to have
optimized corrosion control if the water supplier submits results of tap water
monitoring conducted in accordance with s. NR 809.547 and source water
monitoring conducted in accordance with s. NR 809.549 that demonstrates for 2
consecutive 6-month monitoring periods that the difference between the 90 th
percentile tap water lead level computed under s. NR 809.54 (3) (c), and the
highest source water lead concentration, is less than the practical
quantitation level for lead specified in
40 CFR
141.89(a)(1)(ii).
1. The department may deem that public water
systems whose highest source water lead level is below method detection limit
have optimized corrosion control under this subsection if the 90 th percentile
tap water lead level is less than or equal to the practical quantitation level
for 2 consecutive 6-month monitoring periods.
2. Any public water system deemed to have
optimized corrosion control in accordance with this subsection shall continue
monitoring for lead and copper at the tap no less frequently than once every 3
calendar years using the reduced number of sites specified in s. NR 809.547 (3)
and collecting the samples at times and locations specified in s. NR 809.547 (4) (d) 4. Any water supplier for a public water system that has not conducted
a round of monitoring pursuant to s. NR 809.547 (4) (d) since September 30,
1997, shall complete a round of monitoring pursuant to this subsection as
specified by the department.
3. Any
water suppliers for a public water system deemed to have optimized corrosion
control pursuant to this paragraph shall notify the department in writing
pursuant to s. NR 809.55 (1) (c) 3. of any upcoming long-term change in
treatment or addition of a new source as described in that section. The
department shall review and approve the addition of a new source or long-term
change in water treatment before it is implemented by the water supplier. The
department may require any water supplier to conduct additional monitoring or
to take other action the department deems appropriate to ensure that the water
supplier maintains minimal levels of corrosion in the distribution
system.
4. As of December 1, 2002,
a public water system is not deemed to have optimized corrosion control under
this subsection, and the water supplier shall implement corrosion control
treatment pursuant to subd. 5. unless the public water system meets the copper
action level.
5. Any public water
system triggered into corrosion control because it is no longer deemed to have
optimized corrosion control under this subsection shall implement corrosion
control treatment in accordance with the deadlines in sub. (5). Any large
system shall adhere to the schedule specified in that paragraph for medium-size
systems, with the time periods for completing each step being triggered by the
date the public water system is no longer deemed to have optimized corrosion
control under this subsection.
(3) CRITERIA FOR COMPLETING CORROSION CONTROL
TREATMENT STUDIES FOR SMALL AND MEDIUM-SIZE SYSTEMS. Any water supplier for a
small or medium-size water system that is required to complete the corrosion
control steps due to the exceedance of the lead or copper action level may
cease completing the treatment steps whenever the public water system meets
both action levels during each of 2 consecutive monitoring periods conducted
pursuant to s. NR 809.547 and the results are submitted to the department. If
any such public water system thereafter exceeds the lead or copper action level
during any monitoring period, the water supplier shall recommence completion of
the applicable treatment steps, beginning with the first treatment step which
was not previously completed in its entirety. The department may require a
water supplier to repeat treatment steps previously completed by the water
supplier if the department determines that this is necessary to properly
implement the treatment requirements. The department shall notify the water
supplier in writing of such a determination and explain the basis for its
decision. The water supplier for a small or medium-size water system shall
implement corrosion control treatment steps in accordance with sub. (5),
including a public water system deemed to have optimized corrosion control
under sub. (2) (a), whenever it exceeds the lead or copper action
level.
(4) TREATMENT STEPS AND
DEADLINES FOR LARGE SYSTEMS. Except as provided in sub. (2) (b) and (c), water
suppliers for large systems shall complete the following corrosion control
treatment steps by the indicated dates:
(a)
Step 1: The water supplier shall conduct initial monitoring during 2
consecutive 6-month monitoring periods by January 1, 1993.
(b) Step 2: The water supplier shall complete
corrosion control studies and submit option for optimal corrosion control
treatment to the department by July 1, 1994.
(c) Step 3: The department shall approve
optimal corrosion control treatment by January 1, 1995.
(d) Step 4: The water supplier shall install
optimal corrosion control treatment by January 1, 1997.
(e) Step 5: The water supplier shall complete
follow-up sampling by January 1, 1998.
(f) Step 6: The department shall review
installation of treatment and approve optimal water quality control parameters
by July 1, 1998.
(g) Step 7: The
water supplier shall operate in compliance with the department-approved optimal
water quality control parameters and continue to conduct tap
sampling.
(5) TREATMENT
STEPS AND DEADLINES FOR SMALL AND MEDIUM-SIZE SYSTEMS. Except as provided in
sub. (2), water suppliers for small and medium-size systems shall complete the
following corrosion control treatment steps by the indicated time periods:
(a) Step 1: The water supplier shall conduct
initial tap sampling until the public water system either exceeds the lead or
copper action level or becomes eligible for reduced monitoring under s. NR 809.547 (4) (d). A water supplier exceeding the lead or copper action level
shall recommend optimal corrosion control treatment, under s. NR 809.543 (1),
within six months after the end of the monitoring period during which the
public water system exceeds one of the action levels.
(b) Step 2: Within 12 months after the end of
the monitoring period during which a public water system exceeds the lead or
copper action level, the department may require the water supplier to perform
corrosion control studies, under s. NR 809.543 (2). If the department does not
require the water supplier to perform such studies, the department shall
specify optimal corrosion control treatment, under s. NR 809.543 (4) within the
following timeframes:
1. For medium-size
systems, within 18 months after the end of the monitoring period during which
such public water system exceeds the lead or copper action level.
2. For small systems, within 24 months after
the end of the monitoring period during which such public water system exceeds
the lead or copper action level.
(c) Step 3: If the department requires a
water supplier to perform corrosion control studies under step 2, the water
supplier shall complete the studies within 18 months after the department
requires the studies be conducted.
(d) Step 4: If the water supplier has
performed corrosion control studies under step 2, the department shall review
and determine adequacy of public water system's optimal corrosion control
treatment within 6 months after completion of step 3.
(e) Step 5: The water supplier shall install
optimal corrosion control treatment within 24 months after the department
approves the treatment.
(f) Step 6:
The water supplier shall complete follow-up sampling within 36 months after the
department approves optimal corrosion control treatment.
(g) Step 7: The department shall review the
installation of treatment and approve optimal water quality control parameters
within 6 months after completion of step 6.
(h) Step 8: The water supplier shall operate
in compliance with the department-approved optimal water quality control
parameters and continue to conduct tap sampling.
