Know Your Environment. Protect Your Health.

Nitrite

King County Water District No 90

NOTE: King County Water District No 90 purchases water from Seattle Public Utilities which is required to test for nitrite. Sample information shown below was taken by Seattle Public Utilities.

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020N/A00N/A
2021ND20ND
2022ND20ND
2023ND20ND

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EPA Maximum Contaminant
Level (MCL): 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

NOTE: King County Water District No 90 purchases water from Seattle Public Utilities which is required to test for nitrite. Sample information shown below was taken by Seattle Public Utilities.

Date Lab ID Result
2018-06-12ND
2018-06-12ND
2019-12-17ND
2019-12-17ND
2021-05-184144746ND
2021-05-184144747ND
2022-05-174408902ND
2022-05-174408901ND
2023-05-234543422ND
2023-05-234543421ND