Know Your Environment. Protect Your Health.

Nitrate

Dupont Water System City Of

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.540 ppm54ND - 1.01 ppm
20190.470 ppm107ND - 1.06 ppm
2020N/A00N/A
20210.700 ppm440.420 ppm - 0.980 ppm
20220.670 ppm440.430 ppm - 0.900 ppm
20230.457 ppm65ND - 0.580 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
2018-11-070.420 ppm
2018-11-070.830 ppm
2018-11-07ND
2018-11-071.01 ppm
2018-11-070.440 ppm
2019-07-240.420 ppm
2019-07-240.920 ppm
2019-07-24ND
2019-07-240.480 ppm
2019-09-251.06 ppm
2019-09-250.880 ppm
2019-09-25ND
2019-09-25ND
2019-09-250.440 ppm
2019-09-250.500 ppm
2021-09-2241768050.540 ppm
2021-09-2241767940.420 ppm
2021-09-2241831080.860 ppm
2021-09-2241768060.980 ppm
2022-09-2043489630.840 ppm
2022-09-2043489640.430 ppm
2022-09-2043489620.900 ppm
2022-09-2043479410.510 ppm
2023-04-074441722ND
2023-09-2145306010.500 ppm
2023-09-2145306010.500 ppm
2023-09-2145293050.580 ppm
2023-09-2145293050.580 ppm
2023-09-2145293050.580 ppm