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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

City of Davis

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.

MORE ABOUT THIS CONTAMINANT

 

227

Samples

0

Samples exceeding legal limit (MCL)

204

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20145.31 ppm4948ND - 8.13 ppm
20155.59 ppm5654ND - 9.80 ppm
20165.31 ppm5149ND - 9.60 ppm
20173.34 ppm2720ND - 6.00 ppm
20183.25 ppm2417ND - 6.00 ppm
20193.83 ppm2016ND - 6.50 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

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
2014-01-145810-015-09126.33 ppm
2014-01-145810-023-08536.10 ppm
2014-02-125810-024-10386.55 ppm
2014-02-125810-025-10473.61 ppm
2014-03-115810-015-08254.74 ppm
2014-04-085810-015-09555.20 ppm
2014-04-085810-023-09205.87 ppm
2014-05-135810-015-08377.68 ppm
2014-05-135810-018-07055.65 ppm
2014-05-135810-023-07284.97 ppm
2014-05-135810-024-08306.33 ppm
2014-05-135810-025-08123.39 ppm
2014-06-105810-015-07457.91 ppm
2014-06-105810-023-07256.10 ppm
2014-07-085810-015-08428.13 ppm
2014-07-085810-023-07195.65 ppm
2014-08-055810-002-08224.97 ppm
2014-08-055810-004-08104.29 ppm
2014-08-055810-006-08375.20 ppm
2014-08-055810-009-11204.97 ppm
2014-08-055810-010-09182.48 ppm
2014-08-055810-014-09505.42 ppm
2014-08-055810-015-10368.13 ppm
2014-08-055810-016-08533.84 ppm
2014-08-055810-017-09091.92 ppm
2014-08-055810-018-07536.10 ppm
2014-08-055810-019-07375.20 ppm
2014-08-055810-020-06575.20 ppm
2014-08-055810-023-07205.87 ppm
2014-08-055810-024-10256.55 ppm
2014-08-055810-025-10003.39 ppm
2014-08-055810-026-10140.858 ppm
2014-08-055810-030-10590.452 ppm
2014-08-055810-052-0935ND
2014-09-095810-015-08107.91 ppm
2014-09-095810-023-07475.87 ppm
2014-10-075810-015-09047.91 ppm
2014-10-075810-023-08405.87 ppm
2014-11-045810-006-08454.74 ppm
2014-11-045810-014-09065.20 ppm
2014-11-045810-015-09407.68 ppm
2014-11-045810-019-07404.97 ppm
2014-11-045810-020-07075.20 ppm
2014-11-045810-023-07236.55 ppm
2014-11-045810-024-09346.55 ppm
2014-11-045810-025-09143.39 ppm
2014-11-185810-018-09035.87 ppm
2014-12-025810-015-07567.68 ppm
2014-12-025810-023-06575.87 ppm
2015-01-065810-015-06158.13 ppm
2015-01-065810-023-07145.42 ppm
2015-02-105810-006-08574.97 ppm
2015-02-105810-014-08495.42 ppm
2015-02-105810-015-08339.49 ppm
2015-02-105810-018-09256.10 ppm
2015-02-105810-019-10494.97 ppm
2015-02-105810-020-06394.74 ppm
2015-02-105810-023-09535.42 ppm
2015-02-105810-024-05434.52 ppm
2015-02-105810-025-07023.61 ppm
2015-03-175810-015-05558.36 ppm
2015-03-175810-023-07305.42 ppm
2015-04-075810-015-05134.74 ppm
2015-04-075810-023-07054.52 ppm
2015-05-055810-006-07384.97 ppm
2015-05-055810-014-07495.20 ppm
2015-05-055810-015-08154.74 ppm
2015-05-055810-018-06475.87 ppm
2015-05-055810-020-06124.52 ppm
2015-05-055810-023-07014.74 ppm
2015-05-055810-024-04146.33 ppm
2015-05-055810-025-07573.39 ppm
2015-06-025810-015-05528.36 ppm
2015-06-025810-023-07064.97 ppm
2015-07-075810-002-13334.97 ppm
2015-07-075810-004-12534.29 ppm
2015-07-075810-006-11154.97 ppm
2015-07-075810-010-11482.48 ppm
2015-07-075810-015-13219.49 ppm
2015-07-075810-016-09572.26 ppm
2015-07-075810-017-10301.87 ppm
2015-07-075810-018-07215.42 ppm
2015-07-075810-020-07574.97 ppm
2015-07-075810-023-09044.97 ppm
2015-07-075810-024-11206.78 ppm
2015-07-075810-025-08323.16 ppm
2015-07-075810-026-10410.768 ppm
2015-07-075810-030-0919ND
2015-07-075810-052-0648ND
2015-07-215810-009-07474.97 ppm
2015-08-115810-015-06409.26 ppm
2015-08-115810-023-07227.45 ppm
2015-09-015810-015-06309.26 ppm
2015-09-015810-023-07338.13 ppm
2015-10-065810-006-07494.90 ppm
2015-10-065810-015-09209.80 ppm
2015-10-065810-018-07056.10 ppm
2015-10-065810-020-06525.90 ppm
2015-10-065810-023-08218.30 ppm
2015-10-065810-024-09127.40 ppm
2015-10-065810-025-09023.30 ppm
2015-11-035810-015-09307.50 ppm
2015-11-035810-023-09038.90 ppm
2015-12-015810-015-08268.50 ppm
2015-12-015810-023-07258.30 ppm
2016-01-115810-006-09004.60 ppm
2016-01-115810-015-10068.90 ppm
2016-01-115810-018-10233.40 ppm
2016-01-115810-020-07515.60 ppm
2016-01-115810-023-08257.60 ppm
2016-01-115810-024-09584.80 ppm
2016-01-115810-025-09343.20 ppm
2016-01-265810-019-10054.60 ppm
2016-02-025810-015-08217.00 ppm
2016-02-025810-023-07437.40 ppm
2016-03-015810-015-10382.90 ppm
2016-03-015810-023-07527.10 ppm
2016-04-065810-006-07394.90 ppm
2016-04-065810-015-08374.90 ppm
2016-04-065810-018-07452.70 ppm
2016-04-065810-019-09304.80 ppm
2016-04-065810-020-07185.80 ppm
2016-04-065810-023-10306.70 ppm
2016-04-065810-024-08282.20 ppm
2016-04-065810-025-08003.30 ppm
2016-05-035810-015-06582.70 ppm
2016-05-035810-023-06386.20 ppm
2016-06-075810-015-06269.10 ppm
2016-06-075810-023-06076.70 ppm
2016-07-135810-030-0844ND
2016-07-205810-026-07570.700 ppm
2016-07-205810-052-0843ND
2016-07-275810-004-07504.30 ppm
2016-07-275810-006-08174.80 ppm
2016-07-275810-010-10213.90 ppm
2016-07-275810-015-09439.60 ppm
2016-07-275810-016-08462.80 ppm
2016-07-275810-017-10272.40 ppm
2016-07-275810-018-08035.10 ppm
2016-07-275810-019-09225.00 ppm
2016-07-275810-020-08365.60 ppm
2016-07-275810-023-08557.20 ppm
2016-07-275810-024-09558.30 ppm
2016-07-275810-025-10093.10 ppm
2016-08-175810-015-10409.00 ppm
2016-08-175810-023-07127.60 ppm
2016-09-215810-015-10029.20 ppm
2016-09-215810-023-07558.10 ppm
2016-10-265810-006-10354.80 ppm
2016-10-265810-015-12079.00 ppm
2016-10-265810-018-08354.30 ppm
2016-10-265810-019-08534.70 ppm
2016-10-265810-020-09026.00 ppm
2016-10-265810-023-09437.40 ppm
2016-10-265810-024-11557.50 ppm
2016-10-265810-025-10553.20 ppm
2017-02-155810-006-08584.60 ppm
2017-02-155810-018-08442.40 ppm
2017-02-155810-019-08283.70 ppm
2017-02-155810-020-08055.50 ppm
2017-02-155810-025-09205.40 ppm
2017-03-205810-057-1120ND
2017-05-035810-006-09004.50 ppm
2017-05-035810-018-0852ND
2017-05-035810-019-08103.70 ppm
2017-05-035810-020-07555.00 ppm
2017-05-035810-025-09254.80 ppm
2017-06-145810-057-0820ND
2017-08-025810-006-08595.00 ppm
2017-08-025810-018-08434.70 ppm
2017-08-025810-019-08234.70 ppm
2017-08-025810-020-08055.80 ppm
2017-08-025810-025-09255.50 ppm
2017-08-025810-026-09431.90 ppm
2017-08-025810-052-1115ND
2017-08-035810-030-0625ND
2017-09-205810-057-0910ND
2017-11-145810-006-08185.20 ppm
2017-11-145810-018-08414.00 ppm
2017-11-145810-019-07574.70 ppm
2017-11-145810-020-07406.00 ppm
2017-11-145810-025-10443.20 ppm
2017-12-125810-057-0735ND
2018-02-145810-057-0925ND
2018-02-215810-006-08315.10 ppm
2018-02-215810-018-08203.40 ppm
2018-02-215810-019-07353.20 ppm
2018-02-215810-020-08005.40 ppm
2018-02-215810-025-08463.20 ppm
2018-04-185810-028-0855ND
2018-05-095810-018-09154.70 ppm
2018-05-095810-019-07452.80 ppm
2018-05-095810-020-07294.30 ppm
2018-05-095810-025-08383.10 ppm
2018-08-155810-018-08195.00 ppm
2018-08-155810-019-09025.10 ppm
2018-08-155810-020-10015.90 ppm
2018-08-155810-025-07555.40 ppm
2018-08-155810-028-0720ND
2018-08-155810-030-0640ND
2018-08-155810-052-0930ND
2018-08-155810-057-0840ND
2018-11-072435-018-07335.00 ppm
2018-11-072435-019-07535.00 ppm
2018-11-072435-020-08156.00 ppm
2018-11-072435-025-07525.50 ppm
2018-11-075810-028-0818ND
2019-02-062435-018-07584.00 ppm
2019-02-062435-019-08224.40 ppm
2019-02-062435-020-08465.90 ppm
2019-02-062435-025-07553.50 ppm
2019-05-082435-018-08404.40 ppm
2019-05-082435-019-09072.90 ppm
2019-05-082435-020-09365.10 ppm
2019-05-082435-025-08193.20 ppm
2019-08-079590-025-11025.10 ppm
2019-08-079590-028-1033ND
2019-08-079590-030-1008ND
2019-08-079590-052-1134ND
2019-08-079590-057-1200ND
2019-08-089590-018-10105.50 ppm
2019-08-089590-019-10335.30 ppm
2019-08-089590-020-11036.10 ppm
2019-11-059590-018-10255.30 ppm
2019-11-059590-019-10465.60 ppm
2019-11-059590-020-11046.50 ppm
2019-11-059590-025-09443.70 ppm