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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Cliffdale West

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

 

187

Samples

0

Samples exceeding legal limit (MCL)

142

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.64 ppm3628ND - 7.70 ppm
20152.16 ppm3021ND - 7.70 ppm
20162.32 ppm3123ND - 7.80 ppm
20172.80 ppm3530ND - 5.80 ppm
20182.19 ppm2822ND - 4.60 ppm
20191.97 ppm2718ND - 4.80 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
2014-01-16C315504-021.50 ppm
2014-01-16C315507-011.90 ppm
2014-02-06C315519-01ND
2014-02-18C315521-01ND
2014-02-18C315521-02ND
2014-02-18C315521-04ND
2014-02-19C315509-012.40 ppm
2014-02-19C315509-035.60 ppm
2014-02-19C315512-012.40 ppm
2014-02-19C315515-013.50 ppm
2014-02-19C315515-023.50 ppm
2014-02-19C315517-012.30 ppm
2014-02-19C315517-02ND
2014-02-19C315524-01ND
2014-02-19C315524-023.80 ppm
2014-02-19C315530-013.20 ppm
2014-02-19C402028-024.10 ppm
2014-02-19C402028-03ND
2014-02-20C315532-011.000 ppm
2014-02-20C402028-017.70 ppm
2014-02-20C402028-041.20 ppm
2014-02-24C315528-013.30 ppm
2014-02-25C401921-012.10 ppm
2014-02-25C402030-01ND
2014-02-27C315526-013.00 ppm
2014-02-27C400771-012.40 ppm
2014-02-27C402098-013.30 ppm
2014-02-27C402102-013.30 ppm
2014-04-08C402213-013.90 ppm
2014-04-30C405177-017.50 ppm
2014-04-30C405177-024.60 ppm
2014-07-23C407376-034.20 ppm
2014-07-24C409538-012.20 ppm
2014-07-29C409569-014.10 ppm
2014-10-16C411565-012.50 ppm
2014-10-16C411565-024.40 ppm
2015-01-072.90 ppm
2015-01-07ND
2015-01-132.30 ppm
2015-01-131.50 ppm
2015-01-132.90 ppm
2015-01-202.20 ppm
2015-01-203.60 ppm
2015-01-20ND
2015-01-202.30 ppm
2015-01-203.60 ppm
2015-01-204.80 ppm
2015-01-204.20 ppm
2015-01-20ND
2015-01-213.40 ppm
2015-01-212.50 ppm
2015-01-21ND
2015-01-21ND
2015-01-223.50 ppm
2015-01-223.10 ppm
2015-01-22ND
2015-01-27ND
2015-01-277.70 ppm
2015-01-271.20 ppm
2015-01-27ND
2015-01-28ND
2015-01-283.70 ppm
2015-04-072.70 ppm
2015-07-152.00 ppm
2015-09-242.10 ppm
2015-10-272.50 ppm
2016-01-14C515397-012.80 ppm
2016-01-14C515403-011.70 ppm
2016-01-14C515406-011.20 ppm
2016-01-14C515406-022.60 ppm
2016-01-14C515410-013.20 ppm
2016-01-14C515411-012.80 ppm
2016-01-19C515395-022.60 ppm
2016-01-19C515395-034.80 ppm
2016-01-19C515395-044.20 ppm
2016-01-19C515395-05ND
2016-01-19C515400-012.70 ppm
2016-01-19C515400-02ND
2016-01-19C515400-03ND
2016-01-19C515409-013.70 ppm
2016-01-19C515414-011.40 ppm
2016-01-20C515391-011.90 ppm
2016-01-20CZ00976-013.80 ppm
2016-02-11C515401-01ND
2016-02-11CZ01931-01ND
2016-02-16CZ02090-01ND
2016-02-16CZ02090-023.60 ppm
2016-03-30C515394-012.20 ppm
2016-03-30C515398-01ND
2016-03-30CZ04425-01ND
2016-03-30CZ04426-011.70 ppm
2016-03-30CZ04586-017.80 ppm
2016-04-26CZ05300-016.70 ppm
2016-04-26CZ02652-012.20 ppm
2016-07-20CZ07745-011.60 ppm
2016-07-21CZ07740-012.90 ppm
2016-10-18CZ12569-013.70 ppm
2017-01-11CZ17284-011.30 ppm
2017-01-17CZ17261-013.00 ppm
2017-01-17CZ17265-012.80 ppm
2017-01-17CZ17265-024.80 ppm
2017-01-18CZ17261-061.20 ppm
2017-01-18CZ17274-01ND
2017-01-18CZ17274-023.00 ppm
2017-01-19CZ17259-012.30 ppm
2017-01-23CZ17272-01ND
2017-01-24CA01135-025.30 ppm
2017-01-24CZ17257-021.70 ppm
2017-01-24CZ17272-034.60 ppm
2017-01-25CZ17263-013.30 ppm
2017-01-25CA01134-011.40 ppm
2017-01-25CA01135-015.80 ppm
2017-01-25CA01135-034.10 ppm
2017-01-25CA01135-04ND
2017-01-25CZ17279-012.90 ppm
2017-01-26CZ17277-013.60 ppm
2017-01-31CA01479-011.70 ppm
2017-01-31CZ17268-012.60 ppm
2017-01-31CZ17268-02ND
2017-01-31CZ17268-03ND
2017-01-31CZ17270-012.30 ppm
2017-01-31CZ17281-012.70 ppm
2017-01-31CZ17281-023.80 ppm
2017-04-05CA02305-013.80 ppm
2017-04-18CA04275-024.90 ppm
2017-04-19CA04275-013.70 ppm
2017-06-13CA05061-013.60 ppm
2017-07-19CA07520-014.00 ppm
2017-07-19CA07520-024.40 ppm
2017-07-24CA07527-012.30 ppm
2017-10-10CA12725-012.50 ppm
2017-10-10CA12725-024.70 ppm
2018-01-17CA17858-01 1.90 ppm
2018-01-17CA17858-02 1.60 ppm
2018-01-17CA17873-01 ND
2018-01-17CA17876-01 ND
2018-01-17CA17876-02 3.50 ppm
2018-01-22CA17862-06 1.20 ppm
2018-01-22CA17864-01 3.20 ppm
2018-01-22CA17870-02 ND
2018-01-22CA17880-01 3.60 ppm
2018-01-22CA17883-01 2.40 ppm
2018-01-22CA17883-02 3.80 ppm
2018-01-22CB00988-01 ND
2018-01-23CA17861-01 2.30 ppm
2018-01-23CA17868-01 3.60 ppm
2018-01-23CA17870-01 2.40 ppm
2018-01-23CA17870-03 ND
2018-01-23CA17882-01 3.00 ppm
2018-01-23CA17885-01 3.60 ppm
2018-01-24CB01121-01 2.80 ppm
2018-01-24CB01121-02 2.60 ppm
2018-01-24CB01121-03 4.60 ppm
2018-01-24CB01121-04 3.90 ppm
2018-01-24CB01121-05 ND
2018-01-30CA17872-01 2.10 ppm
2018-01-31CB01421-01 1.20 ppm
2018-04-23CB02580-01 3.60 ppm
2018-06-20CB02577-01 3.10 ppm
2018-07-19CB07859-01 1.30 ppm
2019-01-14CB17915-01 1.80 ppm
2019-01-14CB17915-02 1.90 ppm
2019-01-14CB17919-02 3.10 ppm
2019-01-14CB17919-03 4.80 ppm
2019-01-14CB17919-04 3.40 ppm
2019-01-14CB17919-05 ND
2019-01-14CB17924-01 2.40 ppm
2019-01-14CB17924-02 ND
2019-01-14CB17924-03 ND
2019-01-15CB17927-03 ND
2019-01-16CB17921-01 2.70 ppm
2019-01-16CB17930-01 ND
2019-01-16CB17930-02 2.90 ppm
2019-01-16CB17936-02 3.60 ppm
2019-01-17CB17918-01 ND
2019-01-17CB17923-01 3.40 ppm
2019-01-17CB17934-01 3.20 ppm
2019-01-17CB17935-01 2.60 ppm
2019-01-17CC00951-01 ND
2019-02-25CB17925-01 1.40 ppm
2019-03-13CC03971-01 4.00 ppm
2019-03-19CC04819-01 3.20 ppm
2019-03-20CB17939-01 ND
2019-03-26CC04998-01 ND
2019-04-29CC02988-01 3.90 ppm
2019-05-08CC02986-01 3.50 ppm
2019-08-29CC09211-01 1.40 ppm