Know Your Environment. Protect Your Health.

Nitrate and nitrite

Southwood Water System

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.37 ppm63ND - 3.60 ppm
20190.863 ppm63ND - 3.14 ppm
2020N/A00N/A
20211.46 ppm1613ND - 5.70 ppm
20220.674 ppm72ND - 3.71 ppm
2023N/A00N/A

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
2018-01-231.10 ppm
2018-02-023.50 ppm
2018-04-053.60 ppm
2018-05-04ND
2018-05-09ND
2018-07-19ND
2019-01-283.14 ppm
2019-01-28ND
2019-01-280.790 ppm
2019-01-281.25 ppm
2019-01-28ND
2019-02-08ND
2021-03-1740937741.20 ppm
2021-03-1740969980.0710 ppm
2021-03-1844649880.620 ppm
2021-03-184465076ND
2021-03-184465041ND
2021-03-234098028ND
2021-03-2340969920.0270 ppm
2021-03-2540937730.0610 ppm
2021-03-2540937681.90 ppm
2021-03-2540937722.70 ppm
2021-03-2540937705.70 ppm
2021-03-2540937313.85 ppm
2021-03-2540937694.20 ppm
2021-03-2540937710.380 ppm
2021-03-2540937300.650 ppm
2021-04-1444650812.06 ppm
2022-01-2742373203.71 ppm
2022-02-044268894ND
2022-02-1042688961.01 ppm
2022-11-034388505ND
2022-11-034388503ND
2022-11-284389473ND
2022-12-154407269ND