Know Your Environment. Protect Your Health.

Nitrate

Lake Delton Waterworks

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.

 

44

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.946 ppm660.0470 ppm - 2.60 ppm
20191.05 ppm770.0530 ppm - 4.30 ppm
20200.860 ppm75ND - 3.10 ppm
20211.00 ppm10100.130 ppm - 3.20 ppm
20220.969 ppm770.130 ppm - 3.50 ppm
20230.969 ppm770.130 ppm - 3.40 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
2018-05-2910576590.0510 ppm
2018-05-2910576580.120 ppm
2018-05-2910576610.260 ppm
2018-05-2910576562.60 ppm
2018-05-2910576572.60 ppm
2018-05-2910576600.0470 ppm
2019-05-2211226612.40 ppm
2019-05-2211226624.30 ppm
2019-05-2211226630.280 ppm
2019-05-2211226640.1000 ppm
2019-05-2211226600.0820 ppm
2019-05-2211226650.0530 ppm
2019-06-1911293760.140 ppm
2020-05-28424674ND
2020-05-28424680ND
2020-05-284246710.160 ppm
2020-05-284246780.200 ppm
2020-06-024267883.10 ppm
2020-06-024267832.30 ppm
2020-06-024267980.260 ppm
2021-01-205261110.240 ppm
2021-01-205261100.370 ppm
2021-01-205261092.20 ppm
2021-01-265288010.130 ppm
2021-02-105330673.20 ppm
2021-02-105330680.150 ppm
2021-02-105330680.150 ppm
2021-02-105330673.20 ppm
2021-03-045383030.190 ppm
2021-03-045383030.190 ppm
2022-01-2510952260.340 ppm
2022-01-2510952282.20 ppm
2022-02-0410976000.130 ppm
2022-02-0910991480.300 ppm
2022-02-0910991493.50 ppm
2022-02-1711015350.130 ppm
2022-02-1711015330.180 ppm
2023-03-2013012750.400 ppm
2023-03-2013012730.410 ppm
2023-04-1713131000.150 ppm
2023-04-1713131012.10 ppm
2023-05-0113202543.40 ppm
2023-05-0913233230.130 ppm
2023-05-0913233220.190 ppm