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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.991 ppm | 20 | 14 | ND - 4.12 ppm |
2015 | N/A | 0 | 0 | N/A |
2016 | 0.503 ppm | 15 | 6 | ND - 2.36 ppm |
2017 | 0.394 ppm | 14 | 13 | ND - 3.86 ppm |
2018 | 0.669 ppm | 15 | 14 | ND - 3.51 ppm |
2019 | 0.504 ppm | 14 | 13 | ND - 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 |
---|---|---|
2014-01-02 | BF94398NOX | 0.0900 ppm |
2014-01-02 | BF94385IOCR | 0.0800 ppm |
2014-07-10 | BG72731NOX | ND |
2014-07-10 | BG72732NOX | ND |
2014-07-10 | BG72733NOX | 0.920 ppm |
2014-07-10 | BG72734NOX | 1.07 ppm |
2014-07-10 | BG72735NOX | 2.14 ppm |
2014-07-10 | BG72736NOX | 3.24 ppm |
2014-07-10 | BG72730NOX | ND |
2014-07-24 | BG81507IOCR | ND |
2014-07-24 | BG81514IOCR | 0.740 ppm |
2014-07-24 | BG81513IOCR | 1.30 ppm |
2014-07-24 | BG81512IOCR | 4.12 ppm |
2014-07-24 | BG81511IOCR | 2.62 ppm |
2014-07-24 | BG81510IOCR | 2.11 ppm |
2014-07-24 | BG81509IOCR | 1.30 ppm |
2014-07-24 | BG81508IOCR | 0.0700 ppm |
2014-07-24 | BG81506IOCR | 0.01000 ppm |
2014-07-24 | BG81505IOCR | ND |
2014-07-24 | BG81504IOCR | ND |
2016-06-30 | BN65089NOX | ND |
2016-06-30 | BN65093NOX | 2.36 ppm |
2016-06-30 | BN65092NOX | 0.990 ppm |
2016-06-30 | BN65090NOX | ND |
2016-06-30 | BN65088NOX | ND |
2016-06-30 | BN65091NOX | 0.840 ppm |
2016-07-11 | BN69969IOCR | 2.16 ppm |
2016-07-14 | BN73019NOX | ND |
2016-07-28 | BN81912IOCR | ND |
2016-07-28 | BN81915IOCR | ND |
2016-07-28 | BN81914IOCR | ND |
2016-07-28 | BN81913IOCR | 0.0130 ppm |
2016-07-28 | BN81911IOCR | ND |
2016-07-28 | BN81910IOCR | ND |
2016-07-28 | BN81916IOCR | 1.18 ppm |
2017-06-15 | BY40610NOX | 0.01000 ppm |
2017-06-15 | BY40611NOX | 0.0200 ppm |
2017-06-15 | BY40612NOX | 0.0200 ppm |
2017-06-15 | BY40613NOX | 3.86 ppm |
2017-06-22 | BY44703NOX | 0.600 ppm |
2017-06-29 | BY50186IOCR | 0.580 ppm |
2017-06-29 | BY50180IOCR | 0.0300 ppm |
2017-06-29 | BY50181IOCR | 0.01000 ppm |
2017-06-29 | BY50182IOCR | 0.0200 ppm |
2017-06-29 | BY50183IOCR | 0.0300 ppm |
2017-06-29 | BY50184IOCR | ND |
2017-06-29 | BY50185IOCR | 0.0200 ppm |
2017-06-29 | BY50178NOX | 0.0600 ppm |
2017-08-17 | BY86088NOX | 0.260 ppm |
2018-07-19 | CA94410 | 0.01000 ppm |
2018-07-19 | CA94411 | 0.120 ppm |
2018-07-19 | CA94412 | 0.0500 ppm |
2018-07-19 | CA94413 | 2.49 ppm |
2018-07-26 | CA98739 | 0.153 ppm |
2018-07-26 | CA98738 | ND |
2018-07-26 | CA98737 | 0.0800 ppm |
2018-07-26 | CA98735 | 0.0900 ppm |
2018-07-26 | CA98740 | 2.43 ppm |
2018-07-26 | CA98719 | 3.51 ppm |
2018-07-26 | CA98736 | 0.0200 ppm |
2018-08-23 | CB17441 | 0.200 ppm |
2018-08-23 | CB17437 | 0.1000 ppm |
2018-09-20 | CB35507 | 0.160 ppm |
2018-09-27 | CB59877 | 0.620 ppm |
2019-06-19 | CD38013 | 0.0200 ppm |
2019-06-19 | CD38012 | 2.45 ppm |
2019-06-19 | CD38011 | 0.680 ppm |
2019-06-19 | CD38010 | 0.0200 ppm |
2019-06-24 | CD40812 | 3.35 ppm |
2019-06-26 | CD42474 | 0.0200 ppm |
2019-06-26 | CD42475 | 0.0800 ppm |
2019-06-26 | CD42476 | 0.0500 ppm |
2019-06-26 | CD42473 | 0.0200 ppm |
2019-06-26 | CD42471 | 0.0900 ppm |
2019-06-26 | CD42472 | 0.0300 ppm |
2019-07-03 | CD50737 | 0.01000 ppm |
2019-07-03 | CD50736 | ND |
2019-07-31 | CD69099 | 0.230 ppm |