Know Your Environment. Protect Your Health.

Nitrate

City of Thornton Water System

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0827 ppm110.0827 ppm
20190.119 ppm110.119 ppm
2020ND10ND
20210.121 ppm110.121 ppm
20220.163 ppm110.163 ppm
20230.117 ppm110.117 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
2018-06-28Q18259680040.0827 ppm
2019-06-27Q19405340010.119 ppm
2020-06-09Q2023459004ND
2021-05-06Q21118120060.121 ppm
2022-08-22Q22248100040.163 ppm
2023-10-18Q23445500040.117 ppm