North Dakota

North Dakota Department of Health
Division of Water Quality
Storm Water Program Coordinator
918 East Divide Avenue, 4th Floor
Bismarck, ND 58501-1947

North Dakota Pollutant Discharge Elimination System, Permit No. NDR05-0000, effective April 1, 2015 through March 31, 2020

2. Sample procedures:

a. All samples and measurements taken shall be representative of the discharge. Samples shall be collected from discharges resulting from a storm event that is greater than 0.1 inches in magnitude and that has occurred at least 72 hours from the last 0.1-inch or greater storm event  which generated runoff. Snowmelt which generates runoff considered equivalent to or greater than a 0.1-inch precipitation event qualifies for sampling purposes. However, no more than one sample per year for each sampling site can be from a snowmelt event.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

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