Know Your Environment. Protect Your Health.

Nitrate and nitrite

Rapides Parish Waterworks District 3

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.

 

34

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0275 ppm82ND - 0.110 ppm
20190.0400 ppm62ND - 0.120 ppm
20200.146 ppm76ND - 0.300 ppm
20210.1000 ppm52ND - 0.300 ppm
20220.0500 ppm42ND - 0.1000 ppm
20230.0750 ppm42ND - 0.200 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
2018-02-1635375551005ND
2018-02-1635375551003ND
2018-02-1635375551004ND
2018-02-1635375551005ND
2018-02-1635375551004ND
2018-02-1635375551003ND
2018-03-22353818230010.110 ppm
2018-03-22353818230010.110 ppm
2019-04-17354632570010.120 ppm
2019-04-17354632570010.120 ppm
2019-11-2535515037001ND
2019-11-2535515037002ND
2019-11-2535515037001ND
2019-11-2535515037002ND
2020-01-21B2000218-0030.200 ppm
2020-01-21B2000218-0020.200 ppm
2020-01-21B2000218-001ND
2020-04-07B2001692-0010.300 ppm
2020-04-22B2001837-0020.200 ppm
2020-10-12355851450030.0400 ppm
2020-10-12355851450020.0820 ppm
2021-05-05B2102137-0030.300 ppm
2021-05-05B2102137-004ND
2021-10-05B2105315-001ND
2021-10-05B2105315-002ND
2021-10-05B2105315-0030.200 ppm
2022-04-18B2201845-001ND
2022-09-06B2204414-001ND
2022-09-06B2204414-0020.1000 ppm
2022-09-06B2204414-0030.1000 ppm
2023-01-18B2300206-0040.200 ppm
2023-01-18B2300206-005ND
2023-04-03B2301556-0010.1000 ppm
2023-10-16B2304516-003ND