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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Status: National drinking water standard exists

 

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.

2015-2017:

FOUND
FOUND ABOVE HEALTH GUIDELINES

49

states detected

17,240

utilities detected

160 million

people served

48

states over health guideline

12,942

utilities over health guideline

131 million

people served over health guideline

Health concerns for nitrate and nitrite

Cancer

Harm to fetal growth and child development

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

States reporting nitrate and nitrite in drinking water

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served UtilitiesPeople Served
California1,01226,550,5581,05630,574,962
Texas1,53411,683,2322,77217,982,571
New York37012,950,06745314,690,294
Illinois7629,484,0228458,515,881
Georgia5507,032,3166257,666,097
Ohio4607,142,6905577,618,316
Virginia5503,894,2297756,381,697
Missouri5003,749,1111,0315,050,909
Louisiana1511,614,4966834,402,610
Maryland1274,296,0751324,305,677
New Jersey883,843,629984,123,995
Alabama2073,236,9242283,941,546
Colorado1651,367,1512523,675,324
Arizona2373,536,3002423,541,991
Wisconsin4723,201,4406133,537,070
Oklahoma6933,132,7847783,367,026
Washington7032,816,9627492,987,777
Indiana1182,580,4701432,884,885
Connecticut3621,877,5034672,704,942
Arkansas3091,930,6714072,651,966
Oregon1251,213,7401732,600,041
Nevada1472,570,2651602,573,977
Utah1061,674,6101101,797,513
New Mexico3571,557,9693991,634,227
Nebraska5231,567,2415431,587,820
Hawaii831,425,599891,449,881
Mississippi150479,053226968,869
Delaware106857,035120901,441
North Carolina430266,936461750,767
Montana530537,366681701,711
South Carolina113111,166158667,039
North Dakota103345,075208598,720
Tennessee12586,03813591,404
Alaska198409,008250446,393
Rhode Island58361,29563372,804
Wyoming165289,279236368,748
Maine141153,022198262,251
Idaho67249,15471250,351
Pennsylvania12197,0827195,307
West Virginia65182,79060173,617
New Hampshire5595,64483111,481
Kentucky10189,5469103,720
Florida1250260,388
Michigan435,650335,378
Vermont62,82073,878
Iowa13,78513,785
Minnesota13,29513,295
Kansas33,87611,204
South Dakota001450
MORE
LESS

Filtering technologies that reduce nitrate and nitrite

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Reverse Osmosis

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Ion Exchange

Utilities with the highest amounts of nitrate and nitrite, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Vineyard Ave. Estates Mutual Water CompanyOxnard, CA1 of 136.0 ppm1,200
Eola Water Supply CorporationEola, TX4 of 433.2 ppm165
Santa MonicaSanta Monica, CA1 of 130.0 ppm92,185
City of WeinertWeinert, TX4 of 422.4 ppm208
Diomede Joint UtilitiesLittle Diomede, AK1 of 121.0 ppm184
M & J Trailer Home CommunitySandy, UT1 of 118.5 ppm20
Harrison-ray-burbank Water SystemPasco, WA1 of 118.0 ppm656
Wheeler Municipal Water SystemWheeler, TX4 of 417.7 ppm1,651
Buckingham Water SystemTonasket, WA2 of 217.2 ppm32
Thunderbird Farms Domestic Water Improvement DistrictMaricopa, AZ1 of 117.0 ppm1,600
Turkey Municipal Water System*Turkey, TX3 of 317.0 ppm421
Lake Success Mobile LodgePorterville, CA1 of 115.9 ppm40
Sol Y MarPharr, TX4 of 415.8 ppm103
Okarche Rural Water District Inc.Okarche, OK12 of 1215.5 ppm250
Franklin Water Systems 3Dallas, TX12 of 1215.4 ppm92
Soults Mutual Water CompanyTulare, CA1 of 114.8 ppm120
Klondike Independent School DistrictLamesa, TX3 of 314.7 ppm264
Northside Water Supply CorporationVernon, TX4 of 414.7 ppm225
Grassland Water Supply CorporationTahoka, TX4 of 414.4 ppm55
Greenwood Terrace Mobile Home SubdivisionAmarillo, TX4 of 414.4 ppm120
Rra Guthrie Dumont Water SystemWichita Falls, TX2 of 214.3 ppm402
Rra Hinds Wildcat Water SystemWichita Falls, TX4 of 414.3 ppm178
South Midland County Water SystemsKingsland, TX1 of 114.2 ppm165
East Park EstatesAtkinson, NE3 of 314.1 ppm100
City of DodsonDodson, TX4 of 414.1 ppm109
Canadian County Rural Water District # 1Calumet, OK12 of 1214.0 ppm750
Monterey Park Tract Community Services DistrictCeres, CA1 of 113.8 ppm186
Sherwood Estates Manufactured Townhome CFair Oaks Ranch, TX5 of 513.8 ppm102
OkarcheOkarche, OK12 of 1213.6 ppm1,110
Lemon Cove Water CompanyLemon Cove, CA1 of 113.4 ppm200
City of Byers*Byers, TX4 of 413.2 ppm496
Higuera ApartmentsSan Luis Obispo, CA1 of 113.0 ppm30
Geary*Geary, OK25 of 2512.8 ppm1,258
Greenfield Public Works AuthorityGreenfield, OK25 of 2512.8 ppm123
Lake Morena Oak Shores Mw CompanyCampo, CA5 of 512.7 ppm700
Clove Branch ApartmentsBronx, NY1 of 112.7 ppm50
Welch Water Supply CorporationWelch, TX3 of 312.6 ppm315
Twin Oaks Mobile Home Park MidlandAmarillo, TX4 of 412.6 ppm234
White Fence Farms Mutual Water Company No. 3Quartz Hill, CA2 of 212.6 ppm636
Copper Mountain Ranch CfdCasa Grande, AZ25 of 2512.5 ppm909
Morro Bay PW Department - Water DivisionMorro Bay, CA8 of 812.4 ppm10,327
Lsid-strathmore SystemLindsay, CA1 of 112.0 ppm500
City of CorcoranCorcoran, CA1 of 112.0 ppm24,813
Strathmore Public Utility District*Strathmore, CA1 of 112.0 ppm2,150
DevolDevol, OK24 of 2412.0 ppm150
Grandfield*Grandfield, OK24 of 2412.0 ppm1,110
Cotton County Rural Water District # 1Randlett, OK24 of 2412.0 ppm600
Country Village Mobile Home EstatesCorpus Christi, TX4 of 411.8 ppm138
Homestead Water CompanyMoriarty, NM23 of 2311.8 ppm195
Tierra Del LagoDel Rio, TX1 of 111.8 ppm54

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Nitrate and nitrite, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Santa MonicaSanta Monica, CA1 of 130.0 ppm92,185
Morro Bay PW Department - Water DivisionMorro Bay, CA8 of 812.4 ppm10,327
City of CorcoranCorcoran, CA1 of 112.0 ppm24,813
Monte Vista Water District*Montclair, CA12 of 1210.8 ppm54,460
Florence Water CompanyFlorence, AZ3 of 39.64 ppm14,880
San Fernando Water DepartmentSan Fernando, CA6 of 69.53 ppm23,839
Crescenta Valley CWDLa Crescenta, CA35 of 359.28 ppm32,000
Chelan County PUD 1Wenatchee, WA1 of 19.17 ppm13,170
City of Chino Hills*Chino Hills, CA4 of 47.95 ppm75,655
City of Corona*Corona, CA3 of 47.78 ppm155,896
City of Hastings*Hastings, NE95 of 957.59 ppm25,224
Enid*Enid, OK6 of 67.58 ppm49,347
City of Vernon*Vernon, TX4 of 47.52 ppm11,686
Plover WaterworksPlover, WI3 of 37.50 ppm12,420
Johnson UtilitiesPhoenix, AZ21 of 217.45 ppm62,158
Goodyear Water Department*Goodyear, AZ11 of 117.28 ppm50,001
City of WoodlandWoodland, CA2 of 27.10 ppm56,464
City of South PasadenaSouth Pasadena, CA3 of 36.90 ppm25,899
City of MantecaManteca, CA10 of 106.90 ppm66,451
City of CeresCeres, CA4 of 46.80 ppm42,666
Grover Beach Water DepartmentGrover Beach, CA3 of 36.73 ppm13,156
Decatur*Decatur, IL1 of 16.70 ppm81,860
City of ShafterShafter, CA1 of 16.60 ppm16,928
City of AlhambraAlhambra, CA4 of 46.45 ppm84,679
WeatherfordWeatherford, OK6 of 66.29 ppm10,833
Liberty Water Lpsco*Avondale, AZ50 of 506.27 ppm45,298
Janesville Water UtilityJanesville, WI3 of 36.27 ppm62,720
Elk CityElk City, OK3 of 36.25 ppm10,510
City of Mountain ViewMountain View, CA1 of 16.20 ppm76,000
City of Scottsbluff*Scottsbluff, NE34 of 346.20 ppm15,030
Arizona Water Company - Pinal Valley*Phoenix, AZ48 of 486.10 ppm88,019
City of GilroyGilroy, CA8 of 86.09 ppm39,050
Cal/Am Water Company - San MarinoRosemead, CA28 of 285.94 ppm40,804
Aqua Illinois-Vermilion County*Danville, IL1 of 15.80 ppm38,000
Rehoboth Beach Water Department*Rehoboth Beach, DE133 of 1335.78 ppm30,000
Haralson County Water Auth.*Buchanan, GA11 of 155.75 ppm12,220
City of GrandviewGrandview, WA236 of 2665.70 ppm10,922
California Water Service - LivermoreLivermore, CA4 of 45.65 ppm56,700
Glen Cove CityGlen Cove, NY70 of 715.65 ppm28,000
Monrovia Water DepartmentMonrovia, CA9 of 95.52 ppm36,590
Espanola Water System*Espanola, NM22 of 225.49 ppm10,495
Glendale Water DepartmentGlendale, CA1 of 15.40 ppm195,799
City of AvondaleAvondale, AZ58 of 585.38 ppm83,001
Widefield WSD*Colorado Springs, CO3 of 35.33 ppm19,000
City of Vienna*Vienna, WV2 of 25.33 ppm12,507
Hicksville WDHicksville, NY304 of 3075.27 ppm48,000
Newhall CWD-NewhallSanta Clarita, CA6 of 65.23 ppm12,487
Brookwood Comm. Water SystemFayetteville, NC133 of 1435.22 ppm15,665
Dewey Beach Water DepartmentFrankford, DE1 of 15.20 ppm22,400
Mattoon*Mattoon, IL1 of 15.20 ppm19,000

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Nitrate and nitrite, but it likely has the contaminant in its water supply.