Pennsylvania Code
Title 25 - ENVIRONMENTAL PROTECTION
Part I - Department of Environmental Protection
Subpart C - Protection of Natural Resources
Article II - Water Resources
Chapter 109 - SAFE DRINKING WATER
Subchapter C - MONITORING REQUIREMENTS
Section 109.304 - Analytical requirements
Current through Register Vol. 55, No. 13, March 29, 2025
(a) Sampling and analysis shall be performed in accordance with analytical techniques adopted by the EPA under the Federal act or methods approved by the Department.
(b) An alternate analytical technique may be employed with the written approval of the Department and the concurrence of the Administrator. An alternate technique will be accepted only if it is substantially equivalent to the prescribed test in both precision and accuracy as it relates to the determination of compliance with MCLs or MRDLs or treatment technique requirements. The use of the alternate analytical technique may not decrease the frequency of monitoring required by this subchapter.
(c) For the purpose of determining compliance with the monitoring and analytical requirements established under this subchapter and Subchapters K, L and M (relating to lead and copper; long-term 2 enhanced surface water treatment rule; and additional requirements for ground-water sources), the Department will consider only samples analyzed by a laboratory accredited by the Department, except that measurements for turbidity, fluoridation operation, residual disinfectant concentration, temperature, pH, alkalinity, orthophosphates, silica, calcium, conductivity, daily chlorite and magnesium hardness may be performed by a person meeting one of the following requirements:
(d) A system shall have Cryptosporidium samples analyzed by a laboratory that is approved under the EPA's Laboratory Quality Assurance Evaluation Program for Analysis of Cryptosporidium in Water or a laboratory that has been accredited for Cryptosporidium analysis by an equivalent Department laboratory accreditation program.
(e) A water supplier shall calibrate all turbidimeters used for compliance monitoring using the procedure specified by the manufacturer. At a minimum, calibration with an EPA-approved primary standard shall be conducted at least every 90 days. The Department may extend this 90-day calibration frequency if the calibration due date coincides with a holiday or weekend, or during a water system emergency which prevents timely calibration.
(f) For the purpose of determining compliance with the PFAS MCLs established in § 109.202(a)(4) (relating to State MCLs, MRDLs and treatment technique requirements), sampling and analysis for PFAS shall be conducted as follows:
Contaminant |
Methods | MRL (ng/L) |
(i) PFOA | EPA 533, EPA 537.1, EPA 537 Version 1.1 | 5 |
(ii) PFOS | EPA 533, EPA 537.1, EPA 537 Version 1.1 | 5 |
The provisions of this § 109.304 amended under section 4 of the Pennsylvania Safe Drinking Water Act (35 P.S. § 721.4); and section 1920-A of The Administrative Code of 1929 (71 P.S. § 510-20).
This section cited in 25 Pa. Code § 109.301 (relating to general monitoring requirements); 25 Pa. Code § 252.6 (relating to accreditation-by-rule); 25 Pa. Code § 109.701 (relating to reporting and recordkeeping); 25 Pa. Code § 109.1003 (relating to monitoring requirements); 25 Pa. Code § 109.1202 (relating to monitoring requirements); 25 Pa. Code § 109.1204 (relating to requirements for microbial toolbox components).