New York Codes, Rules and Regulations › Title 10 - DEPARTMENT OF HEALTH › Chapter I - State Sanitary Code › Part 5 - Drinking Water Supplies › Subpart 5-1 - Public Water Systems › Enhanced Treatment For Cryptosporidium › Section 5-1.81 - Source water monitoring requirements at systems using surface water and ground water under the direct influence of surface water (GWUDI) sources

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
Source water monitoring.
(1)
					 Initial round of source water monitoring. Systems shall conduct the following
					 monitoring, based on the monitoring schedule prescribed in paragraph (3) of
					 this subdivision, unless they meet the monitoring exemption criteria in
					 paragraph (4) of this subdivision:
(i)
					 Filtered systems serving at least 10,000 people shall sample their source water
					 for Cryptosporidium, E. coli, and turbidity at least monthly for 24
					 months.
(ii) Unfiltered systems
					 serving at least 10,000 people shall sample their source water for
					 Cryptosporidium at least monthly for 24 months.
(iii) Filtered systems serving fewer than
					 10,000 people:
(a) shall sample their source
					 water for E. coli and use an approved method to enumerate the presence of E.
					 coli at least once every two weeks for 12 months;
(b) may avoid E. coli monitoring if the
					 system notifies the State that it will monitor for Cryptosporidium as described
					 in subparagraph (iv) of this paragraph. The system shall notify the State no
					 later than three months prior to the date the system is otherwise required to
					 start E. coli monitoring under paragraph (3) of this subdivision; and
(c) shall sample their source water for
					 Cryptosporidium at least twice per month for 12 months, or at least monthly for
					 24 months, if, based on monitoring conducted under this subparagraph, they meet
					 one of the following criteria:
(1) For systems
					 using lake/reservoir sources, the annual mean E. coli concentration is greater
					 than 10 E. coli/100 mL;
(2) For
					 systems using flowing stream sources, the annual mean E. coli concentration is
					 greater than 50 E. coli/100 mL; or
(3) The system does not conduct E. Coli
					 monitoring once every two weeks for 12 months.
(4) Systems using ground water under the
					 direct influence of surface water (GWUDI) must comply with the requirements of
					 subclause (1) through (3) of this clause based on the E. coli level that
					 applies to the nearest surface water body. If no surface water body is nearby,
					 the system must comply based on the requirements that apply to systems using
					 lake/ reservoir sources.
(5) the Sta
					 te may approve an alternative to the E. coli concentration specified in
					 subclause (1) and subclause (2) of this clause to trigger Cryptosporidium
					 monitoring. This approval by the State will be provided to the system in
					 writing and will include the basis for the State's determination that the
					 alternative trigger concentration will provide a more accurate identification
					 of whether a system will exceed the Bin 1 Cryptosporidium level specified in
					 section 5-1.83(a)(2)  of
					 this Subpart.
(iv) Unfiltered systems serving fewer than
					 10,000 people shall sample their source water for Cryptosporidium at least
					 twice per month for 12 months or at least monthly for 24 months.
(v) Systems may sample more frequently than
					 required under this section if the sampling frequency is evenly spaced
					 throughout the monitoring period.