Know Your Environment. Protect Your Health.

Nitrate

Starr Water Supply Corporation

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0447 ppm440.0290 ppm - 0.0614 ppm
20190.0537 ppm440.0407 ppm - 0.0620 ppm
20200.0480 ppm440.0352 ppm - 0.0606 ppm
20210.0432 ppm440.0340 ppm - 0.0508 ppm
20220.0562 ppm440.0349 ppm - 0.0834 ppm
20230.0447 ppm440.0374 ppm - 0.0513 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
2018-10-04Q18398590140.0524 ppm
2018-10-04Q18398590150.0359 ppm
2018-10-04Q18398590160.0290 ppm
2018-10-04Q18398590130.0614 ppm
2019-08-27Q19604700100.0407 ppm
2019-08-27Q19604700110.0599 ppm
2019-08-27Q19604700120.0520 ppm
2019-12-11Q19797720040.0620 ppm
2020-09-29Q20383000180.0467 ppm
2020-09-29Q20383000190.0493 ppm
2020-09-29Q20383000200.0352 ppm
2020-12-28Q20502920010.0606 ppm
2021-05-19Q21131430010.0473 ppm
2021-11-17Q21322460030.0407 ppm
2021-11-17Q21322460040.0508 ppm
2021-11-17Q21322460050.0340 ppm
2022-10-19Q22318300010.0571 ppm
2022-10-19Q22318300140.0495 ppm
2022-10-19Q22318300150.0834 ppm
2022-10-19Q22318300160.0349 ppm
2023-06-26Q23243220130.0454 ppm
2023-06-26Q23243220140.0448 ppm
2023-06-26Q23243220150.0374 ppm
2023-06-26Q23243220320.0513 ppm