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 Oklahoma Administrative Code (Last Updated: March 11, 2021)
 TITLE 252. Department of Environmental Quality
 Chapter 690. Water Quality Standards Implementation
 Subchapter 3. Point Source Discharges

  SECTION 252:690-3-86. Implementation of bacteriological criteria to protect the Primary Body Contact Recreation (PBCR) and the Secondary Body Contact Recreation (SBCR) beneficial use  

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  • (a)   PBCR waterbodies - May 1 through September 30. When the use of a bacteriological indicator is determined to be necessary, the following bacteriological limitations shall apply from May 1 through September 30 to protect the PBCR beneficial use:
    (1)   Escherichia coli (E. coli). When E. coli is the bacteriological indicator:
    (A)   The monthly geometric mean shall not exceed 126/100 ml.
    (B)   The daily maximum for lakes shall not exceed 235/100 ml.
    (C)   The daily maximum for all waterbodies other than lakes shall not exceed 406/100 ml.
    (2)   Enterococci. When enterococci is the bacteriological indicator:
    (A)   The monthly geometric mean shall not exceed 33/100 ml.
    (B)   The daily maximum for lakes shall not exceed 61/100 ml.
    (C)   The daily maximum for all waterbodies other than lakes shall not exceed 108/100 ml.
    (b)   PBCR waterbodies - October 1 through April 30. When the use of a bacteriological indicator is determined to be necessary, the SBCR bacteriological limitations listed in (c) of this Section, shall apply from October 1 through April 30 to protect the PBCR beneficial use when the receiving stream is on the 303(d) list for bacteria.
    (c)   SBCR waterbodies. One of the following bacteriological limitations and monitoring requirements shall be used year round for permittees that discharge fecal coliform to waterbodies on the 303(d) list for bacteria:
    (1)   Escherichia coli (E. coli). When E. coli is the bacteriological indicator:
    (A)   The monthly geometric mean shall not exceed 630/100 ml.
    (B)   The daily maximum for lakes shall not exceed 1175/100 ml.
    (C)   The daily maximum for all waterbodies other than lakes shall not exceed 2030/100 ml.
    (2)   Enterococci. When enterococci is the bacteriological indicator:
    (A)   The monthly geometric mean shall not exceed 165/100 ml.
    (B)   The daily maximum for lakes shall not exceed 305/100 ml.
    (C)   The daily maximum for all waterbodies other than lakes shall not exceed 540/100 ml.
    (d)   Indicators used in WLA. Regardless of which bacteriological indicator was used in a permittee's WLA, the permit may contain either of the bacteriological indicators listed in (c) of this Section.
    (e)   Exception. This Section does not apply to discharging lagoons that were permitted and are being operated in compliance with OAC 252:656-11-2(b), unless Water Quality Standards are violated
[Source: Added at 19 Ok Reg 1721, eff 6-13-02; Amended at 28 Ok Reg 1316, eff 7-1-11; Amended at 30 Ok Reg 1097, eff 7-1-13; Amended at 31 Ok Reg 1326, eff 9-12-14; Amended at 33 Ok Reg 1496, eff 9-15-16]