SECTION .0300 - EFFLUENT STANDARDS

15A NCAC 02U .0301      RECLAIMED WATER EFFLUENT STANDARDS

(a)  Reclaimed water treatment processes producing an effluent quality prior to storage, distribution, or utilization that meets the parameter limits listed below shall be classified as Type 2:

(1)           monthly average five-day biochemical oxygen demand (BOD₅) of less than or equal to 5 mg/L and a daily maximum BOD₅ of less than or equal to 10 mg/L;

(2)           monthly average total suspended solids (TSS) of less than or equal to 5 mg/L and a daily maximum TSS of less than or equal to 10 mg/L;

(3)           monthly average ammonia (NH₃-N) of less than or equal to 1 mg/L and a daily maximum NH₃-N of less than or equal to 2 mg/L;

(4)           monthly geometric mean Escherichia coli (E. coli) or fecal coliform level of less than or equal to 3/100 mL and a daily maximum E. coli or fecal coliform level of less than or equal to 25/100 mL;

(5)           monthly geometric mean Coliphage level of less than or equal to 5/100 mL and a daily maximum Coliphage level of less than or equal to 25/100 mL;

(6)           monthly geometric mean Clostridium perfringens level of less than or equal to 5/100 mL and a daily maximum Clostridium perfringens level of less than or equal to 25/100 mL; and

(7)           maximum turbidity of 5 Nephelometric Turbidity Units (NTUs).

(b)  Reclaimed water treatment processes producing an effluent quality prior to storage, distribution, or utilization that meets the parameter limits listed below shall be classified as Type 1:

(1)           monthly average five-day biochemical oxygen demand (BOD₅) of less than or equal to 10 mg/L and a daily maximum BOD₅ of less than or equal to 15 mg/L;

(2)           monthly average total suspended solids (TSS) of less than or equal to 5 mg/L and a daily maximum TSS of less than or equal to 10 mg/L;

(3)           monthly average ammonia (NH₃-N) of less than or equal to 4 mg/L and a daily maximum NH₃-N of less than or equal to 6 mg/L;

(4)           monthly geometric mean Escherichia coli (E. coli) or fecal coliform level of less than or equal to 14/100 mL and a daily maximum E. coli or fecal coliform level of less than or equal to 25/100 mL; and

(5)           maximum turbidity of 10 NTUs.

(c)  Reclaimed water produced by industrial facilities shall not be required to meet the criteria in this Rule if the reclaimed water is used at the facility in an industrial process and the area of use has no public access and does not result in employee exposure.

History Note:        Authority G.S. 143-215.1; 143-215.3(a);

Eff. June 18, 2011;

Readopted Eff. September 1, 2018.