Know Your Environment. Protect Your Health.

Nitrate and nitrite

Sevier County Water Association

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.290 ppm110.290 ppm
20190.340 ppm110.340 ppm
20200.335 ppm440.260 ppm - 0.470 ppm
20210.335 ppm220.280 ppm - 0.390 ppm
20220.130 ppm110.130 ppm
20230.380 ppm110.380 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
2018-01-31Y1803200080.290 ppm
2019-01-22Y1902400060.340 ppm
2020-01-23Y2002400270.320 ppm
2020-01-23Y2002400050.290 ppm
2020-02-03Y2003800040.260 ppm
2020-03-04Y2006500070.470 ppm
2021-02-02Y2103500360.390 ppm
2021-04-06Y2109800260.280 ppm
2022-01-03Y2200600020.130 ppm
2023-01-03Y2300500400.380 ppm