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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Metropolitan DWID

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

 

234

Samples

0

Samples exceeding legal limit (MCL)

234

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.05 ppm37370.720 ppm - 4.10 ppm
20152.29 ppm37370.810 ppm - 4.00 ppm
20162.24 ppm38380.510 ppm - 4.20 ppm
20172.21 ppm43430.700 ppm - 4.00 ppm
20182.19 ppm40400.330 ppm - 4.20 ppm
20192.21 ppm39390.640 ppm - 5.00 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
2014-02-1214B0419-01(2I)4.10 ppm
2014-02-2514B0626-01(2I)1.40 ppm
2014-02-2514B0636-01(2I)2.30 ppm
2014-05-1314E0446-01(2I)4.00 ppm
2014-05-1314E0446-02(2I)2.30 ppm
2014-05-1914E0548-01(2I)1.70 ppm
2014-05-2014E0599-01(2I)2.40 ppm
2014-08-1214H0503-01(2I)3.60 ppm
2014-08-1214H0503-02(2I)3.30 ppm
2014-08-1914H0632-01(2I)1.80 ppm
2014-08-1914H0666-01(2I)2.20 ppm
2014-10-1414J0544-01(2I)1.80 ppm
2014-10-1414J0544-02(2I)1.90 ppm
2014-10-1414J0544-03(2I)0.720 ppm
2014-10-1414J0544-04(2I)3.40 ppm
2014-10-1414J0544-05(2I)0.820 ppm
2014-10-1514J0566-01(2I)1.30 ppm
2014-10-1514J0566-02(2I)1.70 ppm
2014-10-1514J0566-03(2I)1.70 ppm
2014-10-1514J0566-04(2I)1.20 ppm
2014-10-1514J0566-05(2I)0.980 ppm
2014-10-2114J0681-01(2I)2.30 ppm
2014-10-2114J0685-01(2I)1.40 ppm
2014-10-2114J0685-02(2I)1.80 ppm
2014-10-2114J0685-03(2I)2.10 ppm
2014-10-2114J0685-04(2I)1.40 ppm
2014-10-2114J0685-05(2I)1.30 ppm
2014-10-2114J0685-06(2I)3.50 ppm
2014-10-2114J0685-07(2I)2.00 ppm
2014-10-2214J0707-01(2I)1.30 ppm
2014-10-2214J0707-02(2I)1.20 ppm
2014-10-2214J0707-03(2I)0.970 ppm
2014-10-2214J0707-04(2I)2.10 ppm
2014-10-2214J0707-05(2I)1.20 ppm
2014-11-1214K0413-01(2I)3.20 ppm
2014-11-1214K0413-02(2I)3.50 ppm
2014-11-1814K0529-01(2I)1.90 ppm
2015-02-2315B0674-01(2I)2.60 ppm
2015-02-2415B0704-01(2I)1.80 ppm
2015-04-2815E0565-01(2I)2.70 ppm
2015-05-1215E0419-01(2I)3.50 ppm
2015-05-1215E0419-02(2I)3.30 ppm
2015-05-1915E0548-01(2I)2.00 ppm
2015-08-1215H0478-01(2I)3.30 ppm
2015-08-1215H0478-02(2I)3.90 ppm
2015-08-1815H0615-01(2I)2.00 ppm
2015-08-1815H0656-01(2I)2.70 ppm
2015-10-0715J0338-01(2I)1.40 ppm
2015-10-0715J0338-02(2I)0.810 ppm
2015-10-0715J0338-03(2I)3.80 ppm
2015-10-0715J0338-04(2I)1.10 ppm
2015-10-0715J0338-05(2I)1.30 ppm
2015-10-1415J0520-01(2I)1.60 ppm
2015-10-1415J0520-02(2I)1.80 ppm
2015-10-1415J0520-03(2I)3.60 ppm
2015-10-1415J0520-04(2I)2.00 ppm
2015-10-1415J0520-05(2I)1.80 ppm
2015-10-1415J0520-07(2I)0.850 ppm
2015-10-1415J0520-08(2I)2.60 ppm
2015-10-1415J0520-206(2I)2.30 ppm
2015-10-2015J0610-01(2I)2.80 ppm
2015-10-2015J0631-01(2I)2.20 ppm
2015-10-2015J0631-02(2I)1.70 ppm
2015-10-2015J0631-13(2I)2.60 ppm
2015-10-2115J0666-01(2I)2.20 ppm
2015-10-2115J0666-02(2I)1.20 ppm
2015-10-2115J0666-03(2I)1.10 ppm
2015-10-2115J0666-04(2I)1.70 ppm
2015-10-2115J0666-05(2I)2.30 ppm
2015-10-2115J0666-06(2I)1.50 ppm
2015-11-1715K0507-01(2I)3.40 ppm
2015-11-1715K0507-02(2I)4.00 ppm
2015-11-2315K0636-01(2I)2.10 ppm
2015-11-2315K0638-01(2I)3.00 ppm
2016-02-0916B0416-01(2I)3.30 ppm
2016-02-0916B0416-02(2I)3.40 ppm
2016-02-1616B0558-01(21)3.00 ppm
2016-02-1716B0585-01(2I)2.10 ppm
2016-05-1016E0412-01(2I)3.40 ppm
2016-05-1016E0412-02(2I)2.40 ppm
2016-05-1716E0574-01(2I)2.30 ppm
2016-05-17201605180347I3.10 ppm
2016-08-1616H0638-01(2I)2.30 ppm
2016-08-1616H0641-01(2I)3.30 ppm
2016-08-1816H0728-01(2I)3.50 ppm
2016-08-1816H0728-02(2I)2.20 ppm
2016-09-2216I0701-01(2I)2.50 ppm
2016-10-0416J0015-01(2I)1.70 ppm
2016-10-0416J0015-02(2I)2.20 ppm
2016-10-0416J0015-03(2I)1.90 ppm
2016-10-0416J0015-04(2I)2.60 ppm
2016-10-1816J0528-01(2I)1.70 ppm
2016-10-1816J0528-02(2I)1.50 ppm
2016-10-1816J0528-03(2I)2.30 ppm
2016-10-1916J0584-01(2I)1.40 ppm
2016-10-1916J0584-02(2I)1.40 ppm
2016-10-1916J0584-03(2I)1.40 ppm
2016-10-1916J0584-04(2I)1.000 ppm
2016-10-1916J0584-05(2I)0.900 ppm
2016-10-2516J0659-01(2I)1.30 ppm
2016-10-2516J0659-02(2I)1.30 ppm
2016-10-2516J0659-03(2I)0.790 ppm
2016-10-2516J0659-04(2I)4.20 ppm
2016-10-2516J0659-05(2II)0.510 ppm
2016-10-2616J0691-01(2I)2.00 ppm
2016-10-2616J0691-02(2I)1.40 ppm
2016-10-2616J0691-03(2I)3.20 ppm
2016-10-2616J0691-04(2I)2.70 ppm
2016-11-1416K0150-01(2I)2.80 ppm
2016-11-1416K0150-02(2I)3.60 ppm
2016-11-1516K0506-01(2I)1.80 ppm
2016-11-1516K0522-01(2I)2.70 ppm
2017-02-1417B0454-01(2I)2.10 ppm
2017-02-1417B0458-01(2I)3.50 ppm
2017-02-1517B0478-01(2I)3.10 ppm
2017-03-3017C0769-01(2I)1.60 ppm
2017-05-1617E0418-01(2I)3.10 ppm
2017-05-1617E0418-02(2I)2.20 ppm
2017-05-2317E0599-02(2I)3.40 ppm
2017-05-2317E0710-01(2I)2.10 ppm
2017-08-1517H0576-01(2I)2.10 ppm
2017-08-1517H0624-01(2I)3.40 ppm
2017-08-1617H0609-01(2I)1.40 ppm
2017-08-1617H0609-02(2I)2.30 ppm
2017-08-22201708230449I3.20 ppm
2017-08-22201708230450I2.30 ppm
2017-10-1017J0191-01(2I)4.00 ppm
2017-10-1017J0191-02(2I)1.70 ppm
2017-10-1717J0511-01(2I)2.10 ppm
2017-10-1717J0512-01(2I)3.40 ppm
2017-10-2317J0628-01(2I)1.70 ppm
2017-10-2417J0676-01(2I)1.30 ppm
2017-10-2417J0676-02(2I)1.50 ppm
2017-10-2417J0676-03(2I)1.20 ppm
2017-10-2417J0676-04(2I)3.10 ppm
2017-10-24550-92026-11.30 ppm
2017-10-24550-92026-21.50 ppm
2017-10-24550-92026-31.20 ppm
2017-10-24550-92026-43.30 ppm
2017-10-2517J0705-01(2I)1.70 ppm
2017-10-2517J0705-02(2I)1.90 ppm
2017-10-2517J0705-03(2I)1.70 ppm
2017-10-2517J0705-04(2I)2.20 ppm
2017-10-2517J0705-05(2I)1.50 ppm
2017-10-26201710270183I3.30 ppm
2017-10-26201710270184I1.40 ppm
2017-10-3017J0754-01(2I)1.70 ppm
2017-10-3017J0754-02(2I)0.700 ppm
2017-10-3017J0754-03(2I)2.40 ppm
2017-10-3017J0754-04(2I)1.20 ppm
2017-10-3017J0754-05(2I)1.40 ppm
2017-11-2117K0561-01(2I)2.30 ppm
2017-11-2117K0573-01(2I)3.70 ppm
2017-11-28550-93812-13.20 ppm
2017-11-28550-93812-21.80 ppm
2018-02-2018B0507-01(2I)3.70 ppm
2018-02-20550-98262-12.60 ppm
2018-03-14201803160268 I3.20 ppm
2018-03-14201803160269 I3.90 ppm
2018-05-0218E0076-01(2I)0.510 ppm
2018-05-0220180507088 I0.390 ppm
2018-05-08201805100102 I4.00 ppm
2018-05-08201805100677 I3.20 ppm
2018-05-1518E0433-01(2I)3.80 ppm
2018-05-15550-102934-12.60 ppm
2018-06-19550-104623-10.540 ppm
2018-08-2118H0621-01(2I)3.90 ppm
2018-08-21201808230122I3.40 ppm
2018-08-21201808230123I2.40 ppm
2018-08-21550-108361-22.50 ppm
2018-10-0218J0107-01(2I)4.20 ppm
2018-10-02550-110771-10.810 ppm
2018-10-02550-110771-22.60 ppm
2018-10-02550-110771-32.50 ppm
2018-10-0318J0123-01(2I)1.60 ppm
2018-10-0918J0330-01(2I)1.50 ppm
2018-10-09201810110149I0.330 ppm
2018-10-09201810110150I1.40 ppm
2018-10-09201810110151I3.30 ppm
2018-10-09201810110152I2.30 ppm
2018-10-15201810160302I1.80 ppm
2018-10-15201810160304I0.570 ppm
2018-10-15201810160305I0.420 ppm
2018-10-15201810160306I1.30 ppm
2018-10-18201810190701 I1.80 ppm
2018-10-18201810190702 I1.70 ppm
2018-10-18201810190703 I2.50 ppm
2018-10-1820181019700 I1.50 ppm
2018-10-23201810250002 I2.00 ppm
2018-10-23201810250003 I1.30 ppm
2018-10-23201810250004 I0.930 ppm
2018-10-23201810250005 I1.000 ppm
2018-10-23201810250006 I4.00 ppm
2018-11-14201811151214I3.30 ppm
2018-11-14201811151215I2.40 ppm
2019-02-11201902120235I3.50 ppm
2019-02-11201902120236I2.40 ppm
2019-03-0519C0132-01(2I)1.50 ppm
2019-03-0619C0147-01(2I)2.40 ppm
2019-05-1420190515072213.40 ppm
2019-05-1420190515072312.40 ppm
2019-05-2119E0529-01(21)5.00 ppm
2019-05-21550-123181-12.50 ppm
2019-08-1319H0372-01(2I)3.10 ppm
2019-08-1319H0372-02(2I)2.20 ppm
2019-08-2019H0539-01(2I)2.40 ppm
2019-08-20550-128240-12.10 ppm
2019-10-0819J0317-01(2I)3.10 ppm
2019-10-0819J0317-02(2I)2.30 ppm
2019-10-0819J0317-03(2I)1.20 ppm
2019-10-0819J0317-04(2I)1.10 ppm
2019-10-0919J0344-01(2I)1.60 ppm
2019-10-0919J0344-02(2I)0.800 ppm
2019-10-0919J0344-03(2I)1.20 ppm
2019-10-1519J0427-01(2I)0.820 ppm
2019-10-1519J0427-02(2I)2.40 ppm
2019-10-1519J0428-01(2I)4.60 ppm
2019-10-2219J0557-01(2I)2.50 ppm
2019-10-2219J0557-02(2I)1.90 ppm
2019-10-2219J0557-03(2I)1.40 ppm
2019-10-2219J0557-04(2I)1.30 ppm
2019-10-2219J0557-05(2I)1.50 ppm
2019-10-2919J0705-01(21)1.70 ppm
2019-10-2919J0705-02(21)1.80 ppm
2019-10-2919J0705-03(21)1.30 ppm
2019-10-2919J0705-04(21)0.960 ppm
2019-10-2919J0705-05(21)1.30 ppm
2019-11-0519K0107-01(2I)4.30 ppm
2019-11-1219K0350-01(21)3.20 ppm
2019-11-1219K0350-02(21)2.30 ppm
2019-11-1919K0522-01(2I)4.40 ppm
2019-11-1919K0530-01(2I)2.40 ppm
2019-12-2319L0630-01(21)1.30 ppm
2019-12-2319L0632-01(21)0.640 ppm