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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Meriden Water Division

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.

MORE ABOUT THIS CONTAMINANT

 

78

Samples

0

Samples exceeding legal limit (MCL)

30

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.991 ppm2014ND - 4.12 ppm
2015N/A00N/A
20160.503 ppm156ND - 2.36 ppm
20170.394 ppm1413ND - 3.86 ppm
20180.669 ppm1514ND - 3.51 ppm
20190.504 ppm1413ND - 3.35 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The 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
2014-01-02BF94398NOX0.0900 ppm
2014-01-02BF94385IOCR0.0800 ppm
2014-07-10BG72731NOXND
2014-07-10BG72732NOXND
2014-07-10BG72733NOX0.920 ppm
2014-07-10BG72734NOX1.07 ppm
2014-07-10BG72735NOX2.14 ppm
2014-07-10BG72736NOX3.24 ppm
2014-07-10BG72730NOXND
2014-07-24BG81507IOCRND
2014-07-24BG81514IOCR0.740 ppm
2014-07-24BG81513IOCR1.30 ppm
2014-07-24BG81512IOCR4.12 ppm
2014-07-24BG81511IOCR2.62 ppm
2014-07-24BG81510IOCR2.11 ppm
2014-07-24BG81509IOCR1.30 ppm
2014-07-24BG81508IOCR0.0700 ppm
2014-07-24BG81506IOCR0.01000 ppm
2014-07-24BG81505IOCRND
2014-07-24BG81504IOCRND
2016-06-30BN65089NOXND
2016-06-30BN65093NOX2.36 ppm
2016-06-30BN65092NOX0.990 ppm
2016-06-30BN65090NOXND
2016-06-30BN65088NOXND
2016-06-30BN65091NOX0.840 ppm
2016-07-11BN69969IOCR2.16 ppm
2016-07-14BN73019NOXND
2016-07-28BN81912IOCRND
2016-07-28BN81915IOCRND
2016-07-28BN81914IOCRND
2016-07-28BN81913IOCR0.0130 ppm
2016-07-28BN81911IOCRND
2016-07-28BN81910IOCRND
2016-07-28BN81916IOCR1.18 ppm
2017-06-15BY40610NOX0.01000 ppm
2017-06-15BY40611NOX0.0200 ppm
2017-06-15BY40612NOX0.0200 ppm
2017-06-15BY40613NOX3.86 ppm
2017-06-22BY44703NOX0.600 ppm
2017-06-29BY50186IOCR0.580 ppm
2017-06-29BY50180IOCR0.0300 ppm
2017-06-29BY50181IOCR0.01000 ppm
2017-06-29BY50182IOCR0.0200 ppm
2017-06-29BY50183IOCR0.0300 ppm
2017-06-29BY50184IOCRND
2017-06-29BY50185IOCR0.0200 ppm
2017-06-29BY50178NOX0.0600 ppm
2017-08-17BY86088NOX0.260 ppm
2018-07-19CA944100.01000 ppm
2018-07-19CA944110.120 ppm
2018-07-19CA944120.0500 ppm
2018-07-19CA944132.49 ppm
2018-07-26CA987390.153 ppm
2018-07-26CA98738ND
2018-07-26CA987370.0800 ppm
2018-07-26CA987350.0900 ppm
2018-07-26CA987402.43 ppm
2018-07-26CA987193.51 ppm
2018-07-26CA987360.0200 ppm
2018-08-23CB174410.200 ppm
2018-08-23CB174370.1000 ppm
2018-09-20CB355070.160 ppm
2018-09-27CB598770.620 ppm
2019-06-19CD380130.0200 ppm
2019-06-19CD380122.45 ppm
2019-06-19CD380110.680 ppm
2019-06-19CD380100.0200 ppm
2019-06-24CD408123.35 ppm
2019-06-26CD424740.0200 ppm
2019-06-26CD424750.0800 ppm
2019-06-26CD424760.0500 ppm
2019-06-26CD424730.0200 ppm
2019-06-26CD424710.0900 ppm
2019-06-26CD424720.0300 ppm
2019-07-03CD507370.01000 ppm
2019-07-03CD50736ND
2019-07-31CD690990.230 ppm