Know Your Environment. Protect Your Health.

Nitrate

West Sound Utility District #1

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.

 

68

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.294 ppm144ND - 1.80 ppm
20190.200 ppm132ND - 1.53 ppm
2020N/A00N/A
20210.264 ppm134ND - 1.34 ppm
20220.213 ppm154ND - 1.25 ppm
20230.202 ppm132ND - 1.36 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
2018-05-090.510 ppm
2018-05-090.510 ppm
2018-05-09ND
2018-05-09ND
2018-05-091.80 ppm
2018-05-09ND
2018-05-091.30 ppm
2018-05-10ND
2018-05-10ND
2018-05-10ND
2018-07-03ND
2018-07-03ND
2018-07-03ND
2018-07-06ND
2019-03-28ND
2019-05-151.07 ppm
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-151.53 ppm
2019-05-15ND
2021-05-114113398ND
2021-05-114113398ND
2021-05-114113398ND
2021-05-114113422ND
2021-05-114113422ND
2021-05-1141134000.510 ppm
2021-05-1141134000.510 ppm
2021-05-114113421ND
2021-05-114113415ND
2021-05-114113420ND
2021-05-1241134341.07 ppm
2021-05-1241134331.34 ppm
2021-05-124113435ND
2022-05-1844176271.25 ppm
2022-05-184417649ND
2022-05-1844176480.510 ppm
2022-05-1844176480.510 ppm
2022-05-184417650ND
2022-05-184417649ND
2022-05-184417646ND
2022-05-184417647ND
2022-05-184417626ND
2022-05-184417626ND
2022-05-194286053ND
2022-05-1942860540.930 ppm
2022-10-184366340ND
2022-10-184366340ND
2022-10-184366340ND
2023-05-174457433ND
2023-05-174457429ND
2023-05-174457429ND
2023-05-1744574311.27 ppm
2023-05-174457432ND
2023-05-174457430ND
2023-05-174457433ND
2023-05-244469238ND
2023-05-244469238ND
2023-05-244469238ND
2023-05-244469236ND
2023-05-2444692391.36 ppm
2023-05-244469237ND