Statutes, codes, and regulations
New York Codes, Rules and Regulations
Title 6 - DEPARTMENT OF ENVIRONMENTAL CONSERVATIONChapter X - DIVISION OF WATER RESOURCESSubchapter A - GENERALArticle 2 - CLASSIFICATIONS AND STANDARDS OF QUALITY AND PURITY
Part 703 - Surface Water and Groundwater Quality Standards and Groundwater Effluent Limitations
Section 703.4 - Water quality standards for coliforms, enterococci, and E. coli.

N.Y. Comp. Codes R. & Regs. tit. 6 § 703.4

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Current through Register Vol. 46, No. 50, December 11, 2024
Section 703.4 - Water quality standards for coliforms, enterococci, and E. coli.
(a) Total coliforms (number per 100 ml).

Classes

Standard

AA

The monthly median value and more than 20 percent of the samples, from a minimum of five examinations, shall not exceed 50 and 240, respectively.

A, B, C, D, SB, SC, I, SD

The monthly median value and more than 20 percent of the samples, from a minimum of five examinations, shall not exceed 2,400 and 5,000, respectively.

SA

The median most probable number (MPN) value in any series of representative samples shall not be in excess of 70.

A-Special

The geometric mean, of not less than five samples, taken over not more than a 30-day period shall not exceed 1,000.

GA

The maximum allowable limit is 50.

(b) Fecal coliforms (number per 100 ml).

A, B, C, D, SB, SC, I, SD

The monthly geometric mean, from a minimum of five examinations, shall not exceed 200.

A-Special

The geometric mean, of not less than five samples, taken over not more than a 30-day period shall not exceed 200.

SA

In any series of representative samples, the median (or geometric mean) MPN per 100 milliliters of sample shall not exceed 14 and no more than 10 percent of the samples shall have MPN per 100 milliliters of sample in excess of 49 when using a multiple dilution fermentation tube test which examines three 10-milliliter sample portions, three one-milliliter sample portions and three one-tenth (0.1) milliliter sample portions.

(c) The total and fecal coliform standards for classes B, C, D, SB, SC and I shall be met during all periods:
(1) when disinfection is required for SPDES permitted discharges directly into, or affecting the best usage of, the water; or
(2) when the department determines it necessary to protect human health.
(d) Enterococci (number per 100 mL).

Classes

Standard

SA, SB, SC

I

The geometric mean of samples collected over any consecutive 30-day period shall not exceed 35, and no more than 10 percent of the samples collected in the same 30-day period shall exceed 130. For waters with the wet weather (WW) standard designation, these standards will apply during periods of dry weather with exceedances allowed per an approved Use Attainability Analysis (UAA) as required by 40 CFR 131.10.

The geometric mean of samples collected over any consecutive 30-day period shall not exceed 72, and no more than 10 percent of the samples collected in the same 30-day period shall exceed 266.

(e) E. coli (number per 100 mL).

Classes

Standard

Coastal recreation waters of the following classes: A, A-Special, AA, AA-Special, and B

The geometric mean of samples collected over any consecutive 30-day period shall not exceed 126, and no more than 10 percent of the samples collected in the same 30-day period shall exceed 410.

(f)
(1) The enterococci standards for Class SA, SB, and SC waters shall apply:
(i) during the period of May 1st through October 31st;
(ii) in any other instance where the department determines it necessary to protect human health or the best usages of the waters; and
(iii) where required by State or Federal law or interstate compact.
(2) The enterococci standards for Class I waters shall apply on a year-round basis.
(3) The E. coli standards for Class A, A-Special, AA, AA-Special and B coastal recreation waters shall apply:
(i) during the period of May 1st through October 31st;
(ii) in any other instance where the department determines it necessary to protect human health or the best usages of the waters; and
(iii) where required by State or Federal law or interstate compact.
(g) Repealed

N.Y. Comp. Codes R. & Regs. Tit. 6 § 703.4

Amended New York State Register November 4, 2015/Volume XXXVII, Issue 44, eff. 11/4/2015
Amended New York State Register June 26, 2019/Volume XLI, Issue 26, eff. 11/1/2019
Amended New York State Register October 6, 2021/Volume XLIII, Issue 40, eff. 10/6/2021
Amended New York State Register October 18, 2023/Volume XLV, Issue 42, eff. 10/18/2023