Know Your Environment. Protect Your Health.

Nitrate

Creston Water Supply

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)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20190.833 ppm330.500 ppm - 1.10 ppm
20200.720 ppm220.540 ppm - 0.900 ppm
20210.310 ppm21ND - 0.620 ppm
20220.480 ppm110.480 ppm
20230.405 ppm220.260 ppm - 0.550 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
2018-01-22582144ND
2018-06-11587481ND
2019-03-04OE7772991.10 ppm
2019-05-13OE8076990.900 ppm
2019-11-12OE8931210.500 ppm
2020-01-13OE9164150.540 ppm
2020-04-13OE9590180.900 ppm
2021-01-05OE1528869ND
2021-04-06OE16510970.620 ppm
2022-04-12OE20812560.480 ppm
2023-01-03OE22250420.260 ppm
2023-04-10OE22648040.550 ppm