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National Drinking Water Database

Nitrate & nitrite in Oregon

Nitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.

The Most Polluted Communities in Oregon

254 water utilities reported detecting Nitrate & nitrite in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Nitrate & nitrite level

RankSystem Population Served Positive test results of total reported tests Average Level
1Canby Regency
Portland, OR
3001 of 117 ppm
(17 ppm)
2City of Irrigon
Irrigon, OR
1,7401 of 111 ppm
(11 ppm)
3Island City
Island City, OR
9801 of 18.89 ppm
(8.89 ppm)
4Harwoods Mobile Manor
Junction City, OR
702 of 28.55 ppm
(8.2 to 8.9 ppm)
5North Hill Water Corporation
Hermiston, OR
902 of 27.38 ppm
(5.76 to 9 ppm)
6River Village Mhp
Ontario, OR
282 of 26.65 ppm
(5.99 to 7.3 ppm)
7Harmony Acres Mobile Park
Tangent, OR
311 of 16.3 ppm
(6.3 ppm)
8Labish Village Wtr Commission
Salem, OR
5001 of 16 ppm
(6 ppm)
9Pinewood Mobile Manor
The Dalles, OR
1201 of 16 ppm
(6 ppm)
10Hat Rock Water Company
Hermiston, OR
802 of 25.85 ppm
(4.7 to 7 ppm)

Health Based Limits for Nitrate & nitrite

Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.10 ppm
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.10 ppm
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.10 ppm

Violation Summary for Nitrate & nitrite in Oregon

There are no violations reported for this contaminant in Oregon