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25 Pa. Code § 109.304. Analytical requirements.

§ 109.304. Analytical requirements.

 (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 groundwater 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:

   (1)  A person meeting the requirements of §  109.704 (relating to operator certification).

   (2)  A person using a standard operating procedure as provided under authority of the Water and Wastewater Systems Operators’ Certification Act (63 P.S. § §  1001—1015.1) and the regulations promulgated thereunder.

   (3)  An environmental laboratory meeting the requirements of Chapter 252 (relating to environmental laboratory accreditation).

 (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:

   (1)  Sampling and analysis shall be according to the following approved methods and MRLs:

Contaminant Methods MRL
(i) PFOA EPA 533, EPA 537.1,
EPA 537 Version 1.1
(ii) PFOSEPA 533, EPA 537.1,
EPA 537 Version 1.1

   (2)  Analysis shall be conducted by a laboratory accredited by the Department.

   (3)  Accredited laboratories must determine the MDL for each analyte, according to the procedure in Appendix B, Revision 2 to 40 CFR Part 136 (relating to definition and procedure for the determination of the method detection limit) or as specified in the method.

   (4)  Accredited laboratories must analyze Performance Evaluation Samples provided by a third party at least once per year by each method for which the laboratory maintains certification. Results of Performance Evaluation Samples must be within ±30% of the true value.

   (5)  The MRL must be contained within the range of calibration.


   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).


   The provisions of this §  109.304 adopted December 7, 1984, effective December 8, 1984, 14 Pa.B. 4479; amended May 15, 1992, effective May 16, 1992, 22 Pa.B. 2621; amended July 20, 2001, effective July 21, 2001, 31 Pa.B. 3895; amended August 13, 2004, effective August 14, 2004, 34 Pa.B. 4435; amended May 22, 2009, effective May 23, 2009, 39 Pa.B. 2661; corrected August 29, 2009, effective August 1, 2009, 39 Pa.B. 5119, amended December 24, 2009, effective December 26, 2009, 39 Pa.B. 7279; amended August 17, 2018, effective August 18, 2018, 48 Pa.B. 4974; amended January 13, 2023, effective January 14, 2023, 53 Pa.B. 333. Immediately preceding text appears at serial pages (393273) to (393274).

Cross References

   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).

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