Know Your Environment. Protect Your Health.

Nitrate

Stockton Town 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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

23

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.785 ppm330.695 ppm - 0.895 ppm
20190.803 ppm110.803 ppm
20200.759 ppm440.684 ppm - 0.845 ppm
20210.685 ppm440.579 ppm - 0.800 ppm
20220.793 ppm770.714 ppm - 0.900 ppm
20230.705 ppm440.575 ppm - 0.849 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 Result
2018-01-020.895 ppm
2018-04-020.764 ppm
2018-07-170.695 ppm
2019-01-070.803 ppm
2020-01-070.845 ppm
2020-04-060.684 ppm
2020-07-060.764 ppm
2020-10-050.741 ppm
2021-01-040.800 ppm
2021-04-070.638 ppm
2021-07-060.721 ppm
2021-10-050.579 ppm
2022-01-050.793 ppm
2022-04-040.748 ppm
2022-07-050.797 ppm
2022-08-030.800 ppm
2022-08-080.800 ppm
2022-08-170.900 ppm
2022-10-040.714 ppm
2023-01-030.849 ppm
2023-04-050.698 ppm
2023-07-100.575 ppm
2023-10-030.700 ppm