Know Your Environment. Protect Your Health.

Nitrate and nitrite

Crowley Water System (LAWCO)

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0200 ppm102ND - 0.1000 ppm
20190.200 ppm220.200 ppm
20200.200 ppm110.200 ppm
20210.300 ppm110.300 ppm
20220.200 ppm110.200 ppm
20230.200 ppm110.200 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
2018-05-21B1802075-0010.1000 ppm
2018-05-21B1802075-0010.1000 ppm
2018-07-30B1803342-001ND
2018-07-30B1803342-002ND
2018-07-30B1803342-003ND
2018-07-30B1803342-004ND
2018-07-30B1803342-001ND
2018-07-30B1803342-002ND
2018-07-30B1803342-003ND
2018-07-30B1803342-004ND
2019-09-20B1904185-0010.200 ppm
2019-09-20B1904185-0010.200 ppm
2020-12-14B2006602-0060.200 ppm
2021-04-21B2101836-0010.300 ppm
2022-09-01B2204409-0010.200 ppm
2023-10-03B2304290-0010.200 ppm