Know Your Environment. Protect Your Health.

Nitrate

City of Bremerton

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

76

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.105 ppm135ND - 0.310 ppm
20190.0533 ppm121ND - 0.640 ppm
2020N/A00N/A
20210.146 ppm182ND - 1.76 ppm
20220.103 ppm203ND - 0.802 ppm
20230.134 ppm132ND - 0.935 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-01-080.310 ppm
2018-01-080.310 ppm
2018-01-080.310 ppm
2018-01-080.310 ppm
2018-04-03ND
2018-04-03ND
2018-04-03ND
2018-05-03ND
2018-05-03ND
2018-05-03ND
2018-05-03ND
2018-05-150.120 ppm
2018-08-15ND
2019-01-29ND
2019-01-29ND
2019-01-29ND
2019-03-19ND
2019-03-19ND
2019-03-19ND
2019-04-30ND
2019-06-05ND
2019-06-05ND
2019-06-05ND
2019-06-05ND
2019-12-120.640 ppm
2021-01-284074091ND
2021-01-284074091ND
2021-01-284074091ND
2021-02-1040772990.870 ppm
2021-02-1040773001.76 ppm
2021-02-104077301ND
2021-02-234083313ND
2021-04-204107058ND
2021-04-204107058ND
2021-04-204107058ND
2021-05-064113564ND
2021-05-064113564ND
2021-05-064113565ND
2021-05-064113565ND
2021-05-064113565ND
2021-05-064113565ND
2021-05-204124332ND
2021-05-204124333ND
2022-01-054221382ND
2022-01-054221382ND
2022-03-294259874ND
2022-03-294259874ND
2022-03-294259874ND
2022-04-194271379ND
2022-04-194271379ND
2022-04-194271380ND
2022-04-194271378ND
2022-04-194271378ND
2022-04-194271379ND
2022-04-194271378ND
2022-04-194271378ND
2022-04-2744194910.524 ppm
2022-04-2744194920.802 ppm
2022-05-114285923ND
2022-05-114285923ND
2022-05-114285924ND
2022-05-114285923ND
2022-05-1742859220.734 ppm
2023-02-144416082ND
2023-02-144416082ND
2023-02-144416082ND
2023-02-144416082ND
2023-07-124486886ND
2023-07-124486889ND
2023-07-204486883ND
2023-07-254486841ND
2023-07-254486838ND
2023-07-254486833ND
2023-07-254486830ND
2023-07-2644868450.935 ppm
2023-07-2644868550.805 ppm