Know Your Environment. Protect Your Health.

Nitrate and nitrite

Town of Ponder

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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20190.154 ppm440.0392 ppm - 0.395 ppm
20200.352 ppm110.352 ppm
2021N/A00N/A
20220.254 ppm110.254 ppm
20230.248 ppm110.248 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
2019-04-04Q19136970010.126 ppm
2019-04-04Q19136970020.395 ppm
2019-04-04Q19136970070.0555 ppm
2019-04-04Q19136970130.0392 ppm
2020-10-08Q20395500300.352 ppm
2022-06-30Q22185500160.254 ppm
2023-09-14Q23396660320.248 ppm