Know Your Environment. Protect Your Health.

Nitrate and nitrite

Bull Run Mountain/evergreen (brme)

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.153 ppm62ND - 0.480 ppm
20190.220 ppm62ND - 0.770 ppm
20200.250 ppm62ND - 0.970 ppm
20210.248 ppm62ND - 0.950 ppm
20220.267 ppm63ND - 0.560 ppm
20230.203 ppm62ND - 0.680 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
2018-07-18WE-1-1807NND
2018-07-18WB-7-1807N0.480 ppm
2018-07-18WB-5-1807NND
2018-07-18WB-13-1807NND
2018-07-18WB-11-1807N0.440 ppm
2018-07-18WB-12-1807NND
2019-10-28WB-12-1910NND
2019-10-28WB-11-1910N0.550 ppm
2019-10-28WE-1-1910NND
2019-10-28WB-7-1910N0.770 ppm
2019-10-28WB-5-1910NND
2019-10-28WB-13-1910NND
2020-02-24WE-1-2002NND
2020-02-24WB-7-2002N0.970 ppm
2020-02-24WB-5-2002NND
2020-02-24WB-13-2002NND
2020-02-24WB-12-2002NND
2020-02-24WB-11-2002N0.530 ppm
2021-04-2721042610-01NO2NO3ND
2021-04-2721042610-06NO2NO3ND
2021-04-2721042610-05NO2NO3ND
2021-04-2721042610-04NO2NO3ND
2021-04-2721042610-03NO2NO30.540 ppm
2021-04-2721042610-02NO2NO30.950 ppm
2022-07-2622072601-06NO2NO3ND
2022-07-2622072601-03NO2NO30.550 ppm
2022-07-2622072601-02NO2NO30.560 ppm
2022-07-2622072601-01NO2NO3ND
2022-09-2922092907-01_NO2NO3ND
2022-12-1322121301-02_NO2NO30.490 ppm
2023-10-2423102311-01_NO2NO3ND
2023-10-2423102311-02_NO2NO30.680 ppm
2023-10-2423102311-03_NO2NO30.540 ppm
2023-10-2423102311-04_NO2NO3ND
2023-10-2423102311-05_NO2NO3ND
2023-10-2423102311-06_NO2NO3ND