S.D. Admin. R. 74:04:12:25

Current through Register Vol. 51, page 67, December 16, 2024

Section 74:04:12:25 - Control of lead and copper - Designation of optimal corrosion control

Each system shall properly install and operate the optimal corrosion control treatment designated by the department. The department shall evaluate the results of all lead and copper tap water samples and water quality parameter samples to determine whether the water system has properly installed and operated the optimal corrosion control treatment designated by the department. The water system shall provide any additional information the department requests to aid its review. Upon reviewing the results of tap water and water quality parameter monitoring by the system both before and after the system installs optimal corrosion control treatment, the department shall designate:

(1) A range of values for pH measured at each entry point and in all tap samples;

(2) If a corrosion inhibitor is used, an inhibitor concentration range measured at each entry point to the distribution system and in all tap samples;

(3) If alkalinity adjustment is used, an alkalinity concentration range measured at each entry point and in all tap samples; and

(4) If calcium carbonate stabilization is used, a calcium concentration range measured in all tap samples.

These water quality parameters and optimal corrosion control treatment values may be modified by the department upon its own initiative or in response to a request by a water system or other interested party. A request for modification by a system or other interested party must be in writing, explain why the modification is appropriate, and provide supporting documentation. The department may modify its determination if it concludes that such a change is necessary to ensure that the system continues to optimize corrosion control treatment. The department shall make the revised determination in writing and shall set forth the new treatment requirements, explain the basis for the department's decision, and provide an implementation schedule. All systems shall maintain water quality parameter values within the range designated by the department. If the water quality value is outside the designated range, the system is out of compliance. If the system is out of compliance, the system may take a confirmation sample no later than three days after the first sample. If a confirmation sample is taken, the result must be averaged with the first sampling result and the average must be used for compliance determinations.

The department shall allow the EPA regional administrator to review treatment determinations made by the department and issue federal treatment determinations as specified in 40 C.F.R. § 148.82(i) (July 1, 2018).

S.D. Admin. R. 74:04:12:25

31 SDR 21, effective 8/24/2004; 36 SDR 111, effective 1/11/2010; 45 SDR 159, effective 7/1/2019

General Authority: SDCL 34A-3A-3.

Law Implemented: SDCL 34A-3A-3(2).