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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Manchester 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.

MORE ABOUT THIS CONTAMINANT

 

41

Samples

0

Samples exceeding legal limit (MCL)

39

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.84 ppm990.210 ppm - 4.03 ppm
2015N/A00N/A
20161.77 ppm87ND - 3.56 ppm
20171.90 ppm87ND - 4.00 ppm
20181.69 ppm880.240 ppm - 3.48 ppm
20191.87 ppm880.290 ppm - 3.33 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
2014-01-06AA63789-NOX0.780 ppm
2014-01-06AA63780-NOX0.220 ppm
2014-01-06AA63790-NOX2.07 ppm
2014-01-07AA63802-NOX4.03 ppm
2014-01-07AA63803-NOX2.87 ppm
2014-01-08AA63816-NOX2.26 ppm
2014-01-08AA63817-NOX1.32 ppm
2014-01-08AA63819-NOX2.84 ppm
2014-01-13AA63858-IOCR0.210 ppm
2016-01-11AA72820-NOX2.14 ppm
2016-01-11AA72819-NOX1.10 ppm
2016-01-11AA72813-NOX0.270 ppm
2016-01-12AA72838-NOX3.56 ppm
2016-01-12AA72839-NOX2.97 ppm
2016-01-13AA72859-NOX2.52 ppm
2016-01-13AA72860-NOX1.57 ppm
2016-01-14AA72868-IOCRND
2017-01-09AA77655-NOX0.160 ppm
2017-01-09AA77660-NOX1.16 ppm
2017-01-09AA77661-NOX2.45 ppm
2017-01-10AA77684-NOX4.00 ppm
2017-01-10AA77685-NOX3.13 ppm
2017-01-11AA77706-NOX2.67 ppm
2017-01-11AA77707-NOX1.61 ppm
2017-02-17AA78198-IOCRND
2018-01-08AA82323-NOX0.240 ppm
2018-01-08AA82328-NOX0.900 ppm
2018-01-08AA82329-NOX1.92 ppm
2018-01-09AA82347-NOX3.48 ppm
2018-01-09AA82348-NOX2.71 ppm
2018-01-10AA82373-NOX1.41 ppm
2018-01-10AA82372-NOX2.60 ppm
2018-02-23AA82899-IOCR0.290 ppm
2019-05-16AA88408-IOCR0.353 ppm
2019-12-02AA90921-NOX0.290 ppm
2019-12-02AA90923-NOX1.08 ppm
2019-12-02AA90924-NOX2.99 ppm
2019-12-03AA90941-NOX3.33 ppm
2019-12-03AA90942-NOX2.81 ppm
2019-12-04AA90959-NOX2.62 ppm
2019-12-04AA90960-NOX1.48 ppm