Know Your Environment. Protect Your Health.

Nitrate and nitrite

Colchester Estates

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
20190.0233 ppm31ND - 0.0700 ppm
20200.0200 ppm110.0200 ppm
20210.0500 ppm440.0200 ppm - 0.110 ppm
20220.0250 ppm220.0200 ppm - 0.0300 ppm
2023ND10ND

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
2018-03-15D8C1185-02NOXND
2018-09-24D8I2666-01NOXND
2018-10-25D8J2936-01NOXND
2018-11-02D8K0327-05NOXND
2018-12-31D8L2579-01NOXND
2019-02-25D9B2237-02NOXND
2019-03-20D9C2054-01NOXND
2019-06-11CD320760.0700 ppm
2020-12-30CH391690.0200 ppm
2021-05-27CI408300.110 ppm
2021-06-16CI565990.0200 ppm
2021-07-20CI782710.0200 ppm
2021-11-15CJ782060.0500 ppm
2022-02-22CK728680.0300 ppm
2022-12-07CN004940.0200 ppm
2023-12-14CP68976ND