Know Your Environment. Protect Your Health.

Nitrate

South Grayson Special Utility District

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

30

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.120 ppm550.0427 ppm - 0.371 ppm
20190.156 ppm550.0526 ppm - 0.401 ppm
20200.0893 ppm550.0392 ppm - 0.257 ppm
20210.0562 ppm550.0438 ppm - 0.0607 ppm
20220.0670 ppm550.0474 ppm - 0.120 ppm
20230.490 ppm550.0552 ppm - 1.94 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

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-02-06Q18049740080.0450 ppm
2018-10-15Q18408620040.0467 ppm
2018-10-15Q18408620050.0970 ppm
2018-10-15Q18408620160.0427 ppm
2018-10-15Q18408620170.371 ppm
2019-08-13Q19542360030.0526 ppm
2019-08-13Q19542360040.401 ppm
2019-08-13Q19542360050.211 ppm
2019-08-13Q19542360060.0623 ppm
2019-08-13Q19542360090.0528 ppm
2020-08-06Q20311940200.0392 ppm
2020-08-06Q20311940210.257 ppm
2020-08-06Q20311940220.0450 ppm
2020-08-06Q20311940230.0517 ppm
2020-08-06Q20311940370.0537 ppm
2021-06-16Q21157710060.0601 ppm
2021-11-10Q21316310060.0593 ppm
2021-11-10Q21316310070.0438 ppm
2021-11-10Q21316310080.0607 ppm
2021-11-10Q21316310090.0572 ppm
2022-02-08Q22042510040.120 ppm
2022-04-26Q22124660030.0474 ppm
2022-04-26Q22124660040.0629 ppm
2022-04-26Q22124660050.0497 ppm
2022-04-26Q22124660060.0551 ppm
2023-05-16Q23184390180.0570 ppm
2023-05-16Q23184390190.0617 ppm
2023-05-16Q23184390200.334 ppm
2023-05-16Q23184390210.0552 ppm
2023-05-16Q23184390371.94 ppm