Know Your Environment. Protect Your Health.

Nitrate and nitrite

Meridian Water Department

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.

 

79

Samples

0

Samples exceeding legal limit (MCL)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.655 ppm43ND - 1.40 ppm
20191.16 ppm32ND - 3.20 ppm
20201.05 ppm209ND - 4.30 ppm
20213.50 ppm333.50 ppm
20221.23 ppm2415ND - 4.10 ppm
20231.08 ppm2513ND - 4.00 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
2018-03-26I20180032802301.10 ppm
2018-03-26I20180032802451.40 ppm
2018-03-26I2018003280246ND
2018-04-10I2018041203110.120 ppm
2019-04-092019041001023.20 ppm
2019-12-16201912170165ND
2019-12-162019121701660.270 ppm
2020-03-102020031102534.30 ppm
2020-03-10202003110242ND
2020-03-172020031803412.90 ppm
2020-03-172020031804871.30 ppm
2020-03-172020031804453.00 ppm
2020-03-18202003190169ND
2020-04-07202004080530ND
2020-04-072020040805580.910 ppm
2020-07-29202007300124ND
2020-08-05202008060243ND
2020-08-06202008070395ND
2020-08-06202008070424ND
2020-08-06202008070429ND
2020-08-132020081401950.250 ppm
2020-08-192020082001613.70 ppm
2020-11-23202011240342ND
2020-11-232020112403440.410 ppm
2020-11-24202011250284ND
2020-11-242020112502754.30 ppm
2020-12-02202012030482ND
2021-01-202021012102943.50 ppm
2021-07-212021072202763.50 ppm
2021-11-162021111706843.50 ppm
2022-02-15202202160930ND
2022-02-15202202160929ND
2022-02-15202202170047ND
2022-02-152022021700461.30 ppm
2022-02-22202202231265ND
2022-02-22202202231264ND
2022-02-222022022312630.0510 ppm
2022-02-222022022312610.230 ppm
2022-02-22202202231260ND
2022-03-012022030209923.30 ppm
2022-03-012022030209934.10 ppm
2022-03-012022030209940.910 ppm
2022-03-012022030302621.90 ppm
2022-03-01202203030263ND
2022-03-02202203030898ND
2022-03-022022030308963.00 ppm
2022-03-022022030308973.00 ppm
2022-03-302022033102392.00 ppm
2022-04-122022041307843.10 ppm
2022-05-182022052002841.70 ppm
2022-11-16380-28629-10.590 ppm
2022-12-19380-31896-14.00 ppm
2022-12-19380-31949-10.420 ppm
2022-12-27380-32595-1ND
2023-08-01380-57235-1ND
2023-08-02380-57431-1AAND
2023-08-02380-57437-10.680 ppm
2023-08-02380-57439-10.190 ppm
2023-08-02380-57460-1ND
2023-08-02380-57496-1ND
2023-08-02380-57434-10.940 ppm
2023-08-02380-57464-11.20 ppm
2023-08-07380-57977-12.90 ppm
2023-08-07380-57957-1ND
2023-08-07380-57974-1ND
2023-08-07380-57897-1ND
2023-08-07380-57894-14.00 ppm
2023-08-07380-57899-12.10 ppm
2023-08-09380-58461-13.60 ppm
2023-08-09380-58355-1ND
2023-08-09380-58481-1ND
2023-08-09380-58496-13.50 ppm
2023-08-10380-58702-1ND
2023-08-10380-58749-1ND
2023-08-10380-58742-1ND
2023-09-26380-64488-12.70 ppm
2023-09-26380-64427-12.70 ppm
2023-11-14380-71138-10.450 ppm
2023-11-14380-71156-12.00 ppm