Know Your Environment. Protect Your Health.

Nitrate

Meriden Water Division

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.

 

86

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.668 ppm1514ND - 3.51 ppm
20190.540 ppm1312ND - 3.35 ppm
20200.450 ppm14140.01000 ppm - 3.81 ppm
20210.381 ppm14140.01000 ppm - 3.37 ppm
20220.676 ppm17170.01000 ppm - 3.60 ppm
20230.523 ppm13130.0200 ppm - 3.78 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
2018-07-19CA944110.120 ppm
2018-07-19CA944120.0500 ppm
2018-07-19CA944132.49 ppm
2018-07-19CA944100.01000 ppm
2018-07-26CA987193.51 ppm
2018-07-26CA987402.43 ppm
2018-07-26CA987350.0900 ppm
2018-07-26CA987360.0200 ppm
2018-07-26CA987370.0800 ppm
2018-07-26CA98738ND
2018-07-26CA987390.140 ppm
2018-08-23CB174410.200 ppm
2018-08-23CB174370.1000 ppm
2018-09-20CB355070.160 ppm
2018-09-27CB598770.620 ppm
2019-06-19CD380100.0200 ppm
2019-06-19CD380110.680 ppm
2019-06-19CD380122.45 ppm
2019-06-24CD408123.35 ppm
2019-06-26CD424730.0200 ppm
2019-06-26CD424720.0300 ppm
2019-06-26CD424710.0800 ppm
2019-06-26CD424760.0500 ppm
2019-06-26CD424750.0800 ppm
2019-06-26CD424740.0200 ppm
2019-07-03CD507370.01000 ppm
2019-07-03CD50736ND
2019-07-31CD690990.230 ppm
2020-06-10CG104790.0200 ppm
2020-06-10CG104780.01000 ppm
2020-06-17CG160890.01000 ppm
2020-06-17CG160910.01000 ppm
2020-06-17CG160900.0300 ppm
2020-06-17CG160880.0300 ppm
2020-06-17CG160870.0500 ppm
2020-06-17CG160860.0200 ppm
2020-06-24CG206100.01000 ppm
2020-06-24CG206090.01000 ppm
2020-07-08CG295323.81 ppm
2020-07-29CG432110.470 ppm
2020-07-29CG432120.910 ppm
2020-07-29CG432130.910 ppm
2021-06-07CI457140.01000 ppm
2021-06-07CI457180.0200 ppm
2021-06-07CI457170.0200 ppm
2021-06-07CI457150.01000 ppm
2021-06-07CI457130.0200 ppm
2021-06-07CI457160.0400 ppm
2021-06-09CI510910.0200 ppm
2021-06-09CI510920.0300 ppm
2021-06-09CI510930.0500 ppm
2021-06-09CI510940.0300 ppm
2021-06-09CI510950.710 ppm
2021-06-09CI510963.37 ppm
2021-08-25CJ135000.500 ppm
2021-08-25CJ135010.500 ppm
2022-05-25CL382090.0200 ppm
2022-05-25CL382080.0200 ppm
2022-06-01CL457780.0200 ppm
2022-06-01CL457770.01000 ppm
2022-06-01CL457760.0400 ppm
2022-06-01CL457750.01000 ppm
2022-06-01CL457740.0200 ppm
2022-06-01CL457730.750 ppm
2022-06-01CL457720.610 ppm
2022-06-01CL457710.0200 ppm
2022-06-01CL457700.0600 ppm
2022-06-01CL457690.01000 ppm
2022-06-01CL457790.750 ppm
2022-06-27CL645553.54 ppm
2022-10-26CM708010.690 ppm
2022-10-26CM708021.33 ppm
2022-11-09CM805683.60 ppm
2023-01-30CN322200.0200 ppm
2023-01-30CN322190.0200 ppm
2023-03-08CN554310.0300 ppm
2023-03-08CN554330.0300 ppm
2023-03-13CN587240.0700 ppm
2023-03-13CN587250.0800 ppm
2023-03-15CN602270.870 ppm
2023-03-15CN602280.780 ppm
2023-03-15CN602230.750 ppm
2023-03-15CN602210.170 ppm
2023-03-15CN602220.0500 ppm
2023-03-22CN655820.150 ppm
2023-07-17CO519143.78 ppm