Know Your Environment. Protect Your Health.

Nitrate and nitrite

Lake Delton Waterworks

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

14

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
20200.860 ppm75ND - 3.10 ppm
2021N/A00N/A
2022N/A00N/A
20230.983 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

ppm = parts per million

All test results

Date Lab ID Result
2020-05-28424674ND
2020-05-28424680ND
2020-05-284246710.160 ppm
2020-05-284246780.200 ppm
2020-06-024267980.260 ppm
2020-06-024267832.30 ppm
2020-06-024267883.10 ppm
2023-03-2013012750.400 ppm
2023-03-2013012730.410 ppm
2023-04-1713131000.150 ppm
2023-04-1713131012.20 ppm
2023-05-0113202543.40 ppm
2023-05-0913233230.130 ppm
2023-05-0913233220.190 ppm