15A NCAC 18A .3402      BACTERIOLOGICAL LIMITS FOR SWIMMING AREAS (Effective april 1, 2021)

(a)  The enterococcus level in a Tier I swimming area shall not equal or exceed either:

(1)           a geometric mean of 35 enterococci per 100 milliliters of water; or

(2)           a single sample of 104 enterococci per 100 milliliters of water.

(b)  The enterococcus level in a Tier II swimming area shall not equal or exceed a single sample of 104 enterococci per 100 milliliters of water.

History Note:        Authority G.S. 113-134; 113-221.3; 143B-289.52;

Eff. February 1, 2004;

Readopted Eff. April 1, 2021.

15A NCAC 18A .3402      BACTERIOLOGICAL LIMITS FOR SWIMMING AREAS (effective until March 31, 2021)

(a)  The enterococcus level in a Tier I swimming area shall not exceed either:

(1)           A geometric mean of 35 enterococci per 100 milliliter of water, that includes a minimum of at least five samples collected within 30 days; or

(2)           A single sample of 104 enterococci per 100 milliliter of water.

(b)  The enterococcus level in a Tier II swimming area shall not exceed a single sample of 276 enterococci per 100 milliliter of water.

(c)  The enterococcus level in a Tier III swimming area shall not exceed two consecutive samples of 500 enterococci per 100 milliliter of water.

History Note:        Authority G.S. 130A-233.1;

Eff. February 1, 2004.