Know Your Environment. Protect Your Health.

Nitrate and nitrite

Shady Harbor Fire District

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.02 ppm440.230 ppm - 1.39 ppm
20190.920 ppm440.210 ppm - 1.27 ppm
2020N/A00N/A
20210.850 ppm440.210 ppm - 1.14 ppm
20220.590 ppm550.180 ppm - 1.18 ppm
2023N/A00N/A

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
2018-04-241801832-03_WL161.27 ppm
2018-04-241801832-01_WL160.230 ppm
2018-04-241801832-04_WL161.39 ppm
2018-04-241801832-02_WL161.19 ppm
2019-04-261901821-03_WL160.210 ppm
2019-04-261901821-01_WL161.27 ppm
2019-04-261901821-02_WL161.04 ppm
2019-04-261901821-04_WL161.16 ppm
2021-04-122101744-01_WL161.14 ppm
2021-04-122101744-04_WL160.210 ppm
2021-04-122101744-03_WL161.12 ppm
2021-04-122101744-02_WL160.930 ppm
2022-04-272201737-02_0.180 ppm
2022-04-272201737-03_1.13 ppm
2022-04-272201737-01_1.18 ppm
2022-04-272201737-04_0.220 ppm
2022-04-272201737-05_0.240 ppm