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<br /> <br />'..,.."~' <br />,", <br />-,.'.' <br />If,::: <br /> <br />'.~:.. <br />'.-,' <br />fJf. <br /> <br />Nt <br />~ <br />-.oJ <br />'" <br />;;1' <br />'tfj <br /> <br />~~ <br />~;:j <br /> <br />r}J <br />~~lJ <br /> <br />;~~ <br />-,' <br /> <br />~;E <br />h'~ <br /> <br />individual sewage disposal systems, agricultural feedlots, and grazing <br /> <br /> <br />animals. Water quality standards for fecal coliform of 200/100 m1 and <br /> <br />2000/100 m1 have been adopted for primary contact and secondary contact <br /> <br />recreational waters, respectively. These standards have been used to assess <br /> <br />bacterial impacts from nonpoint sources. <br /> <br />Nutrients <br /> <br />The nonpoint source nutrients of concern in Colorado are nitrate and <br /> <br />phosphate. They are attributed to fertilizers, animal and human wastes, and <br /> <br />urban runoff. A water quality standard of 10 mg/1 nitrate-nitrogen has been <br /> <br />established for drinking water supplies, however, in Colorado, no surface <br /> <br />water and very few groundwater bodies have been identified as exceeding the <br /> <br />standard. Nutrients may stimulate excessive growth of algae or nuisance <br /> <br />aquatic weeds in lakes and reservoirs, rendering waters aesthetically <br />::;,) <br />",-, unattractive or unsuitsble for recreation. Nitrate criterion, values less <br />,L,: <br /> <br />,i?~~ <br />{-'~'~ <br />fJ <br /> <br />i"'~ <br />S.::- ,~ <br /><":~ <br />t::.:c. <br /> <br />ti:~ <br />ll,<,-l <br /> <br />i~ <br /> <br />>:~ <br />- :~ <br /> <br />::'.~ <br /> <br /> <br />than 10 mg/1 were selected to show the relative condition of the state's <br /> <br />waters for drinking supply purposes. <br /> <br />Phosphorus is generally the limiting nutrient in the growth of algae or weeds <br /> <br />in aquatic environments, and therefore is important to control in terms of <br /> <br />protecting lakes and reservoirs for aquatic life and recreational uses. <br /> <br />Colorado has established water quality standards for phosphorus for three. <br /> <br />specific reservoirs threatened by urban growth within their watershed. The <br /> <br />standards, which apply to the body of the reservoir as an average during the <br /> <br />-39- <br />