Know Your Environment. Protect Your Health.

Nitrate

Dyersville Municipal Water Company

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.472 ppm220.303 ppm - 0.640 ppm
2019N/A00N/A
20200.673 ppm220.649 ppm - 0.697 ppm
20210.325 ppm220.0500 ppm - 0.600 ppm
20220.817 ppm330.706 ppm - 0.914 ppm
2023ND30ND

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
2018-01-102A80253-050.640 ppm
2018-01-102A80253-060.303 ppm
2020-01-212A00441-010.697 ppm
2020-01-212A00441-020.649 ppm
2021-01-061EA0393-010.600 ppm
2021-01-061EA0393-020.0500 ppm
2022-01-052FA0110-010.914 ppm
2022-01-052FA0110-020.832 ppm
2022-09-072FI0141-030.706 ppm
2023-01-112GA0283-01ND
2023-01-112GA0283-02ND
2023-07-052GG0065-03ND