Know Your Environment. Protect Your Health.

Nitrate and nitrite

Zachary 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.

 

42

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND120ND
20190.0200 ppm102ND - 0.1000 ppm
20200.0600 ppm52ND - 0.200 ppm
20210.0800 ppm52ND - 0.200 ppm
20220.400 ppm51ND - 2.00 ppm
20230.0200 ppm51ND - 0.1000 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
2018-03-02AE20799ND
2018-03-02AE20798ND
2018-03-02AE20797ND
2018-03-02AE20796ND
2018-03-02AE20790ND
2018-03-02AE20796ND
2018-03-02AE20797ND
2018-03-02AE20798ND
2018-03-02AE20799ND
2018-03-02AE20790ND
2018-11-26B1805544-001ND
2018-11-26B1805544-001ND
2019-06-18B1902537-002ND
2019-06-18B1902550-0010.1000 ppm
2019-06-18B1902537-003ND
2019-06-18B1902537-002ND
2019-06-18B1902537-001ND
2019-06-18B1902550-0010.1000 ppm
2019-06-18B1902537-004ND
2019-06-18B1902537-003ND
2019-06-18B1902537-001ND
2019-06-18B1902537-004ND
2020-03-20B2001372-0010.1000 ppm
2020-03-20B2001372-002ND
2020-03-20B2001372-0030.200 ppm
2020-03-20B2001372-004ND
2020-03-20B2001372-005ND
2021-02-19B2100629-001ND
2021-02-19B2100629-0040.200 ppm
2021-02-19B2100629-0030.200 ppm
2021-02-19B2100629-002ND
2021-12-31B2200010-001ND
2022-06-06B2202679-005ND
2022-06-06B2202679-006ND
2022-06-06B2202679-007ND
2022-06-06B2202679-008ND
2022-12-28B2300014-0012.00 ppm
2023-12-12B2305246-001ND
2023-12-12B2305246-002ND
2023-12-12B2305246-003ND
2023-12-12B2305246-004ND
2023-12-12B2305246-0050.1000 ppm