Know Your Environment. Protect Your Health.

Nitrate and nitrite

Lafayette Utilities Water System

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.

 

69

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0643 ppm284ND - 0.500 ppm
2019ND220ND
2020ND60ND
20210.140 ppm53ND - 0.300 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
2018-02-09AE20665ND
2018-02-09AE20664ND
2018-02-09AE20665ND
2018-02-09AE20664ND
2018-03-05AE20865ND
2018-03-05AE20853ND
2018-03-05AE20856ND
2018-03-05AE20859ND
2018-03-05AE20862ND
2018-03-05AE20865ND
2018-03-05AE209530.400 ppm
2018-03-05AE20952ND
2018-03-05AE20862ND
2018-03-05AE20859ND
2018-03-05AE20856ND
2018-03-05AE20853ND
2018-03-05AE209530.400 ppm
2018-03-05AE20952ND
2018-04-30AE216190.500 ppm
2018-04-30AE216190.500 ppm
2018-05-14AE21745ND
2018-05-14AE21745ND
2018-06-18AE21916ND
2018-06-18AE21916ND
2018-06-19AE21919ND
2018-06-19AE21922ND
2018-06-19AE21919ND
2018-06-19AE21922ND
2019-01-1435442884001ND
2019-01-1435442884002ND
2019-01-14B1900254-001ND
2019-01-14B1900254-002ND
2019-01-1435442884001ND
2019-01-1435442884002ND
2019-01-14B1900254-001ND
2019-01-14B1900254-002ND
2019-03-2235457457001ND
2019-03-2235457457002ND
2019-03-2235457457001ND
2019-03-2235457457002ND
2019-08-12B1903460-002ND
2019-08-12B1903460-004ND
2019-08-12B1903460-003ND
2019-08-12B1903460-002ND
2019-08-12B1903460-001ND
2019-08-12B1903460-005ND
2019-08-12B1903460-004ND
2019-08-12B1903460-003ND
2019-08-12B1903460-001ND
2019-08-12B1903460-005ND
2020-05-1535551258005ND
2020-05-1535551258004ND
2020-05-1535551258003ND
2020-05-1535551258002ND
2020-07-20B2003551-005ND
2020-07-20B2003551-004ND
2021-02-08B2100522-0060.200 ppm
2021-02-08B2100522-0070.300 ppm
2021-06-21B2102780-006ND
2021-06-21B2102780-0070.200 ppm
2021-06-21B2102780-008ND
2022-04-27B2202191-001ND
2022-05-23B2202455-007ND
2022-05-23B2202455-008ND
2022-05-23B2202455-009ND
2023-05-22B2302104-004ND
2023-05-22B2302104-005ND
2023-05-22B2302104-006ND
2023-05-22B2302104-007ND