Know Your Environment. Protect Your Health.

Nitrate and nitrite

Limerick Water 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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20190.620 ppm110.620 ppm
20200.177 ppm31ND - 0.530 ppm
2021ND10ND
2022N/A00N/A
20230.395 ppm21ND - 0.790 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
2019-12-181912-01849-0020.620 ppm
2020-04-092004-00924-004ND
2020-04-092004-00923-001ND
2020-06-222006-02949-0020.530 ppm
2021-06-03402101012ND
2023-03-202303-03667-002ND
2023-09-182309-03878-0020.790 ppm