Know Your Environment. Protect Your Health.

Nitrate and nitrite

Marianna Waterworks

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
20190.0250 ppm41ND - 0.1000 ppm
2020ND40ND
20210.0800 ppm42ND - 0.180 ppm
2022ND40ND
2023ND40ND

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
2018-02-20Y180530081ND
2018-04-16Y181090025ND
2018-07-25Y182080020ND
2018-10-30Y183050007ND
2019-01-16Y1901700340.1000 ppm
2019-04-16Y191080010ND
2019-09-23Y192690001ND
2019-10-14Y192900019ND
2020-01-27Y200300027ND
2020-04-28Y201210008ND
2020-08-11Y202260001ND
2020-11-23Y203300003ND
2021-01-18Y2102100040.140 ppm
2021-05-10Y211330005ND
2021-08-11Y2122400190.180 ppm
2021-11-10Y213160049ND
2022-02-07Y220410023ND
2022-04-26Y221180029ND
2022-08-09Y222230035ND
2022-11-07Y223130067ND
2023-01-23Y230250031ND
2023-05-08Y231310002ND
2023-08-07Y232220002ND
2023-11-14Y233200018ND