Table 7-13

Home About Us Our Policies Darby Subwatersheds Landowner Information Search Our Site Comments

Back Up

Table 7-13

Statewide numerical and narrative criteria for recreational use designations. For each designation at least one of the two bacteriological standards (fecal coliform or E. coli)must be met. These criteria apply outside the mixing zone.
 

Bathing waters

Fecal coliform - geometric mean fecal coliform content (either MPN or MF), based on not less than five samples within a thirty-day period, shall not exceed 200 per 100 ml and fecal coliform content (either MPN or MF) shall not exceed 400 per 100 ml in more than ten percent of the samples taken during any thirty-day period.
 

E. coli - geometric mean E. coli content (either MPN or MF), based on not less than five samples within a thirty-day period, shall not exceed 126 per 100 ml and E. coli content (either MPN or MF) shall not exceed 235 per 100 ml in more than ten percent of the samples taken during any thirty-day period.


Primary contact

Fecal coliform - geometric mean fecal coliform content (either MPN or MF), based on not less than five samples within a thirty-day period, shall not exceed 1,000 per 100 ml and fecal coliform content (either MPN or MF) shall not exceed 2,000 per 100 ml in more than ten percent of the samples taken during any thirty-day period.

E. coli - geometric mean E. coli content (either MPN or MF), based on not less than five samples within a thirty-day period, shall not exceed 126 per 100 ml and E. coli content (either MPN or MF) shall not exceed 298 per 100 ml in more than ten percent of the samples taken during any thirty-day period.


Secondary contact

Fecal coliform - shall not exceed 5,000 per 100 ml (either MPN or MF) in more than ten per cent of the samples taken during any thirty-day period.

E. coli - shall not exceed 576 per 100 ml in more than ten per cent of the samples taken during any thirty-day period.
Back Up

All information found on this website is for informational purposes only by the Darby Joint Board of Supervisors. All text, images, logos and information contained on this website are property of the Joint Board and they may not be used or reproduced without permission of the Joint Board. 
For problems or questions regarding this website please contact the Darby Watershed Coordinator.
Last updated: November 18, 2008.