Know Your Environment. Protect Your Health.

Nitrate and nitrite

City of Sunnyside

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

16

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND10ND
2020N/A00N/A
20211.08 ppm74ND - 2.20 ppm
20220.790 ppm42ND - 2.14 ppm
20231.11 ppm42ND - 2.24 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

ppm = parts per million

All test results

Date Lab ID Result
2019-11-05ND
2021-04-0640957722.14 ppm
2021-08-254164005ND
2021-08-254164006ND
2021-08-2541640071.07 ppm
2021-09-2141807952.20 ppm
2021-09-214172738ND
2021-09-2141727372.15 ppm
2022-04-0642629592.14 ppm
2022-08-2443343351.02 ppm
2022-08-244334337ND
2022-08-244334339ND
2023-05-2444967182.24 ppm
2023-05-2444967172.19 ppm
2023-06-134548835ND
2023-06-134548836ND