Know Your Environment. Protect Your Health.

Nitrate and nitrite

Ripley County Public Water Supply District 1 West

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0873 ppm32ND - 0.240 ppm
20190.150 ppm32ND - 0.240 ppm
20200.144 ppm32ND - 0.223 ppm
20210.254 ppm220.200 ppm - 0.307 ppm
20220.197 ppm220.180 ppm - 0.214 ppm
20230.203 ppm220.202 ppm - 0.204 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
2018-10-17AD345800.0220 ppm
2018-10-17AD345810.240 ppm
2018-10-17AD34582ND
2019-10-09AD569660.240 ppm
2019-10-09AD569670.210 ppm
2019-10-09AD56968ND
2020-10-1420167140.223 ppm
2020-10-1420167150.208 ppm
2020-10-142016716ND
2021-10-1421182800.200 ppm
2021-10-1421182810.307 ppm
2022-10-0522197900.214 ppm
2022-10-0522197890.180 ppm
2023-10-0523169660.202 ppm
2023-10-0523169670.204 ppm