Know Your Environment. Protect Your Health.

Nitrate and nitrite

City of Deridder 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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.225 ppm880.200 ppm - 0.300 ppm
20190.150 ppm86ND - 0.200 ppm
20200.103 ppm42ND - 0.280 ppm
20210.225 ppm43ND - 0.400 ppm
20220.125 ppm42ND - 0.300 ppm
20230.150 ppm43ND - 0.300 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
2018-10-25B1805132-0040.200 ppm
2018-10-25B1805132-0030.300 ppm
2018-10-25B1805132-0010.200 ppm
2018-10-25B1805132-0020.200 ppm
2018-10-25B1805132-0030.300 ppm
2018-10-25B1805132-0040.200 ppm
2018-10-25B1805132-0020.200 ppm
2018-10-25B1805132-0010.200 ppm
2019-10-07B1904570-0020.200 ppm
2019-10-07B1904570-0010.200 ppm
2019-10-07B1904570-004ND
2019-10-07B1904570-0030.200 ppm
2019-10-07B1904570-0020.200 ppm
2019-10-07B1904570-0010.200 ppm
2019-10-07B1904570-004ND
2019-10-07B1904570-0030.200 ppm
2020-10-1535585676001ND
2020-10-1535585676004ND
2020-10-15355856760030.280 ppm
2020-10-15355856760020.130 ppm
2021-09-22B2105102-0010.200 ppm
2021-09-22B2105102-0020.300 ppm
2021-09-22B2105102-0030.400 ppm
2021-09-22B2105102-004ND
2022-07-18B2203345-005ND
2022-07-18B2203345-0060.200 ppm
2022-07-18B2203345-007ND
2022-07-18B2203345-0080.300 ppm
2023-05-23B2302270-001ND
2023-05-23B2302270-0020.1000 ppm
2023-05-23B2302270-0030.300 ppm
2023-05-23B2302270-0040.200 ppm