Know Your Environment. Protect Your Health.

Nitrate

Caddo Lake Water Supply Corporation

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0499 ppm220.0102 ppm - 0.0896 ppm
20190.0440 ppm21ND - 0.0880 ppm
20200.0406 ppm21ND - 0.0812 ppm
20210.0465 ppm21ND - 0.0929 ppm
20220.0542 ppm220.0318 ppm - 0.0766 ppm
20230.0483 ppm220.0188 ppm - 0.0778 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

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-09-20Q18377260050.0896 ppm
2018-09-20Q18377260110.0102 ppm
2019-06-10Q19334180040.0880 ppm
2019-06-10Q1933418013ND
2020-10-22Q20412230080.0812 ppm
2020-10-22Q2041223009ND
2021-05-24Q21135250030.0929 ppm
2021-05-24Q2113525007ND
2022-11-22Q22350790010.0318 ppm
2022-11-22Q22350790140.0766 ppm
2023-06-29Q23251570080.0778 ppm
2023-06-29Q23251570090.0188 ppm