Oklahoma Administrative Code › Title 252 - Department of Environmental Quality › Chapter 730 - Oklahoma's Water Quality Standards › Subchapter 5 - Surface Water Quality Standards › Part 3 - Beneficial Uses and Criteria to Protect Uses › Section 252:730-5-16 - Primary Body Contact Recreation

Current through Vol. 41, No. 20, July 1, 2024
(a) Primary Body
				  Contact Recreation involves direct body contact with the water where a
				  possibility of ingestion exists. In these cases the water shall not contain
				  chemical, physical or biological substances in concentrations that are
				  irritating to skin or sense organs or are toxic or cause illness upon ingestion
				  by human beings.
(b) In waters
				  designated for Primary Body Contact Recreation the following limits for
				  bacteria set forth in (c) of this section shall apply only during the
				  recreation period of May 1 to September 30. The criteria for Secondary Body
				  Contact Recreation will apply during the remainder of the year.
(c) Compliance with OAC
				  252:730-5-16 shall be based upon
				  meeting the requirements of one of the options specified in (1) or (2) of this
				  subsection (c) for bacteria. Upon selection of one (1) group or test method,
				  said method shall be used exclusively over the time period prescribed
				  therefore. Provided, where concurrent data exist for multiple bacterial
				  indicators on the same waterbody or waterbody segment, no criteria exceedances
				  shall be allowed for any indicator group.
(1)
Escherichia coli (E. coli):
The E. coli geometric mean
				  criterion is 126/100 ml. For swimming advisory and permitting purposes, E. coli
				  shall not exceed a monthly geometric mean of 126/100 ml based upon a minimum of
				  not less than five (5) samples collected over a period of not more than thirty
				  (30) days. For swimming advisory and permitting purposes, no sample shall
				  exceed a 75% one-sided confidence level of 235/100 ml in lakes and high use
				  waterbodies and the 90% one-sided confidence level of 406/100 ml in all other
				  Primary Body Contact Recreation beneficial use areas. These values are based
				  upon all samples collected over the recreation period. For purposes of sections
				  303(d) and 305(b) of the federal Clean Water Act as amended, beneficial use
				  support status shall be assessed using only the geometric mean criterion of
				  126/100 milliliters compared to the geometric mean of all samples collected
				  over the recreation period.
(2)
Enterococci:
The Enterococci geometric mean criterion is
				  33/100 ml. For swimming advisory and permitting purposes, Enterococci shall not
				  exceed a monthly geometric mean of 33/100 ml based upon a minimum of not less
				  than five (5) samples collected over a period of not more than thirty (30)
				  days. For swimming advisory and permitting purposes, no sample shall exceed a
				  75% one-sided confidence level of 61/100 ml in lakes and high use waterbodies
				  and the 90% one-sided confidence level of 108/100 ml in all other Primary Body
				  Contact Recreation beneficial use areas. These values are based upon all
				  samples collected over the recreation period. For purposes of sections 303(d)
				  and 305(b) of the federal Clean Water Act as amended, beneficial use support
				  status shall be assessed using only the geometric mean criterion of 33/100
				  milliliters compared to the geometric mean of all samples collected over the
				  recreation period.