Know Your Environment. Protect Your Health.

Nitrate

Liberty Lake Sewer & Water District

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.12 ppm550.509 ppm - 1.54 ppm
20190.966 ppm440.385 ppm - 1.23 ppm
2020N/A00N/A
20211.00 ppm440.650 ppm - 1.40 ppm
20220.722 ppm440.452 ppm - 0.958 ppm
20230.855 ppm440.537 ppm - 1.13 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
2018-03-260.850 ppm
2018-04-101.54 ppm
2018-04-101.24 ppm
2018-04-101.48 ppm
2018-04-190.509 ppm
2019-03-251.21 ppm
2019-03-251.23 ppm
2019-03-250.385 ppm
2019-03-251.04 ppm
2021-04-0140928000.839 ppm
2021-04-0140927981.40 ppm
2021-04-0140927991.12 ppm
2021-06-1742168320.650 ppm
2022-04-2742718810.953 ppm
2022-04-2742718820.452 ppm
2022-04-2742718840.525 ppm
2022-04-2742718830.958 ppm
2023-04-1144370211.13 ppm
2023-04-1144370220.537 ppm
2023-04-1144370230.775 ppm
2023-04-1144370200.977 ppm