How much chlorine is in your tap water?

Your water company publishes its chlorine level every year. We put the latest numbers in one place.

Fountain Valley, CA

City of Fountain Valley · uses chlorine · 2025 data

What a swimming pool needs (minimum)1 mg/L

Source: CDC

Your tap water — average level0.46 mg/L

Source: City of Fountain Valley water report

Most US tap water is allowed to carry4 mg/L

Source: US EPA

Shower with filtered water →

All cities, by state

Alabama (6)

Birmingham2.97 mg/L
Hoover2.97 mg/L
Huntsville3.8 mg/L
Mobile2 mg/L
Montgomery1.9 mg/L
Tuscaloosa2.4 mg/L

Alaska (1)

Anchorage0.95 mg/L

Arizona (17)

Buckeye1 mg/L
Casa Grande1.4 mg/L
Chandler0.93 mg/L
Flagstaff0.69 mg/L
Gilbert0.92 mg/L
Glendale1.09 mg/L
Goodyear1 mg/L
Lake Havasu City0.78 mg/L
Maricopa1.35 mg/L
Mesa0.65 mg/L
Peoria0.94 mg/L
Phoenix0.84 mg/L
Queen Creek0.95 mg/L
Scottsdale0.64 mg/L
Tempe1.2 mg/L
Tucson1 mg/L
Yuma0.57 mg/L

Arkansas (2)

Fayetteville0.98 mg/L
Little Rock0.97 mg/L

California (150)

Alameda2.4 mg/L
Anaheim1.1 mg/L
Apple Valley0.95 mg/L
Arcadia0.96 mg/L
Bakersfield1.3 mg/L
Beaumont0.7 mg/L
Bellflower1.6 mg/L
Berkeley2.4 mg/L
Brentwood2.61 mg/L
Buena Park0.86 mg/L
Burbank2.1 mg/L
Camarillo2.4 mg/L
Carlsbad2.14 mg/L
Carson1.9 mg/L
Cathedral City0.5 mg/L
Chico0.6 mg/L
Chino0.53 mg/L
Citrus Heights0.8 mg/L
Clovis1.26 mg/L
Colton1.08 mg/L
Compton1.09 mg/L
Concord2.1 mg/L
Corona1.98 mg/L
Costa Mesa2.07 mg/L
Cupertino1.42 mg/L
Daly City2.91 mg/L
Davis0.8 mg/L
Delano2.2 mg/L
Diamond Bar2.11 mg/L
Dublin2.14 mg/L
Eastvale1.28 mg/L
Elk Grove1.28 mg/L
Encinitas2.83 mg/L
Escondido2.7 mg/L
Fairfield0.54 mg/L
Folsom1.09 mg/L
Fontana0.96 mg/L
Fountain Valley0.46 mg/L
Fremont2.1 mg/L
Fresno1.45 mg/L
Fullerton1.3 mg/L
Gardena2.4 mg/L
Glendale1.25 mg/L
Glendora0.78 mg/L
Hanford1.42 mg/L
Hayward2.9 mg/L
Hemet1.7 mg/L
Hesperia0.5 mg/L
Highland0.69 mg/L
Huntington Beach0.91 mg/L
Huntington Park1.8 mg/L
Indio0.7 mg/L
Inglewood1.8 mg/L
Irvine1.8 mg/L
Jurupa Valley1.28 mg/L
La Habra1.2 mg/L
Lakewood0.63 mg/L
Lancaster1 mg/L
Lincoln0.72 mg/L
Livermore2 mg/L
Lodi0.74 mg/L
Long Beach2.15 mg/L
Los Angeles1.7 mg/L
Lynwood1.3 mg/L
Madera0.25 mg/L
Manteca0.97 mg/L
Menifee1.6 mg/L
Merced0.67 mg/L
Milpitas2.78 mg/L
Mission Viejo1.83 mg/L
Modesto0.91 mg/L
Monterey Park0.73 mg/L
Moreno Valley1.5 mg/L
Mountain View2.82 mg/L
Murrieta1.6 mg/L
Napa0.67 mg/L
National City2.9 mg/L
Newport Beach1.8 mg/L
Norwalk1.5 mg/L
Novato0.68 mg/L
Oakland2.4 mg/L
Oceanside2.6 mg/L
Ontario0.95 mg/L
Orange1.1 mg/L
Oxnard1.51 mg/L
Palm Desert0.5 mg/L
Palmdale1 mg/L
Palo Alto2.78 mg/L
Paramount1.19 mg/L
Pasadena1.4 mg/L
Perris1.5 mg/L
Pico Rivera0.67 mg/L
Pittsburg1.5 mg/L
Placentia1.7 mg/L
Pleasanton2.31 mg/L
Pomona1.13 mg/L
Rancho Cordova1 mg/L
Rancho Cucamonga0.53 mg/L
Redding0.81 mg/L
Redlands1.1 mg/L
Redondo Beach2.1 mg/L
Redwood City2.66 mg/L
Richmond2.4 mg/L
Riverside0.58 mg/L
Rocklin0.78 mg/L
Roseville0.78 mg/L
Sacramento0.8 mg/L
Salinas0.99 mg/L
San Bernardino0.74 mg/L
San Clemente1.86 mg/L
San Diego1.75 mg/L
San Francisco2.6 mg/L
San Jacinto1.7 mg/L
San Jose1.42 mg/L
San Leandro2.4 mg/L
San Marcos2.1 mg/L
San Mateo2.7 mg/L
San Rafael1.82 mg/L
San Ramon2.4 mg/L
Santa Ana1 mg/L
Santa Barbara0.79 mg/L
Santa Clara0.59 mg/L
Santa Cruz0.86 mg/L
Santa Maria1.9 mg/L
Santa Monica1.8 mg/L
Santa Rosa1.16 mg/L
Simi Valley2.06 mg/L
South Gate0.96 mg/L
South San Francisco2.8 mg/L
Stockton1.91 mg/L
Sunnyvale2.4 mg/L
Thousand Oaks1.64 mg/L
Torrance1.74 mg/L
Tulare0.87 mg/L
Turlock0.9 mg/L
Union City2.1 mg/L
Vacaville0.72 mg/L
Vallejo1.03 mg/L
Victorville0.74 mg/L
Visalia1 mg/L
Vista2.53 mg/L
Walnut Creek2.4 mg/L
Watsonville0.6 mg/L
West Covina1.4 mg/L
Westminster0.8 mg/L
Whittier0.75 mg/L
Woodland0.73 mg/L
Yorba Linda1.3 mg/L
Yuba City1.5 mg/L
Yucaipa1.05 mg/L

Colorado (5)

Aurora1.87 mg/L
Boulder0.89 mg/L
Greeley0.81 mg/L
Thornton2.6 mg/L
Westminster2.4 mg/L

Connecticut (4)

Bridgeport0.78 mg/L
Hartford0.5 mg/L
New Haven1.5 mg/L
Stamford0.84 mg/L

District of Columbia (1)

Washington3.1 mg/L

Florida (25)

Boca Raton3 mg/L
Cape Coral1.23 mg/L
Clearwater3.18 mg/L
Coral Gables2.5 mg/L
Coral Springs2.7 mg/L
Deltona3.1 mg/L
Doral2.5 mg/L
Fort Lauderdale2.3 mg/L
Gainesville0.98 mg/L
Hollywood2.42 mg/L
Jacksonville0.95 mg/L
Lakeland2 mg/L
Largo3.8 mg/L
Miami2.5 mg/L
Miramar2.14 mg/L
Orlando1.2 mg/L
Palm Bay3.2 mg/L
Palm Coast3.38 mg/L
Pembroke Pines2.8 mg/L
Pompano Beach3.36 mg/L
Port St. Lucie3.14 mg/L
St. Petersburg3.73 mg/L
Tallahassee0.81 mg/L
Tampa3.6 mg/L
West Palm Beach3.21 mg/L

Georgia (14)

Alpharetta1.99 mg/L
Athens0.89 mg/L
Atlanta1.13 mg/L
Brookhaven1.7 mg/L
Columbus2.12 mg/L
Dunwoody1.7 mg/L
Johns Creek1.99 mg/L
Mableton2 mg/L
Marietta2 mg/L
Roswell1.99 mg/L
Sandy Springs1.13 mg/L
Smyrna2 mg/L
Stonecrest1.7 mg/L
Warner Robins1.38 mg/L

Hawaii (1)

Honolulu0.3 mg/L

Idaho (3)

Boise0.9 mg/L
Coeur d'Alene0.21 mg/L
Meridian1.25 mg/L

Illinois (6)

Aurora3 mg/L
Chicago1 mg/L
Elgin3 mg/L
Naperville1 mg/L
Rockford1 mg/L
Springfield2 mg/L

Indiana (10)

Anderson1 mg/L
Bloomington3.1 mg/L
Carmel1.01 mg/L
Elkhart1 mg/L
Evansville3 mg/L
Fort Wayne2.07 mg/L
Indianapolis2 mg/L
Mishawaka0.9 mg/L
South Bend1 mg/L
Westfield2 mg/L

Iowa (3)

Cedar Rapids3.1 mg/L
Davenport3 mg/L
Des Moines1.2 mg/L

Kansas (7)

Kansas City2.72 mg/L
Lenexa3.1 mg/L
Olathe2.8 mg/L
Overland Park3.1 mg/L
Shawnee3.1 mg/L
Topeka3.4 mg/L
Wichita3.4 mg/L

Kentucky (2)

Lexington2.9 mg/L
Louisville2.69 mg/L

Louisiana (4)

Baton Rouge2 mg/L
Lafayette1.55 mg/L
New Orleans3.3 mg/L
Shreveport2.7 mg/L

Maryland (2)

Baltimore0.52 mg/L
Frederick1.22 mg/L

Massachusetts (16)

Boston1.99 mg/L
Brockton1.53 mg/L
Cambridge2.42 mg/L
Fall River0.05–1.63 mg/L
Framingham1.99 mg/L
Haverhill0.78 mg/L
Lawrence0.85 mg/L
Lowell1.33 mg/L
Lynn0.61 mg/L
Methuen1.82 mg/L
Peabody2.26 mg/L
Quincy1.99 mg/L
Springfield0.71 mg/L
Taunton2 mg/L
Weymouth Town0.8–1.68 mg/L
Worcester1.05 mg/L

Michigan (18)

Ann Arbor2.5 mg/L
Battle Creek0.9 mg/L
Dearborn Heights0.71 mg/L
Detroit0.95 mg/L
Farmington Hills1.03 mg/L
Grand Rapids1.04 mg/L
Kalamazoo1.02 mg/L
Kentwood0.76 mg/L
Lansing2 mg/L
Livonia0.88 mg/L
Pontiac0.87 mg/L
Rochester Hills1.02 mg/L
St. Clair Shores1.02 mg/L
Sterling Heights1.02 mg/L
Taylor0.71 mg/L
Warren0.95 mg/L
Westland0.88 mg/L
Wyoming0.94 mg/L

Minnesota (16)

Blaine0.55 mg/L
Bloomington1.97 mg/L
Brooklyn Park0.51 mg/L
Burnsville1.02 mg/L
Coon Rapids0.54 mg/L
Duluth1.71 mg/L
Eagan0.75 mg/L
Eden Prairie1.03 mg/L
Lakeville0.38 mg/L
Maple Grove0.37 mg/L
Minneapolis3.27 mg/L
Minnetonka0.49 mg/L
Plymouth0.63 mg/L
Rochester1.02 mg/L
Saint Paul3.19 mg/L
St. Cloud3.01 mg/L

Mississippi (3)

Gulfport1 mg/L
Jackson3 mg/L
Southaven1 mg/L

Missouri (3)

Independence1.89 mg/L
Springfield1.53 mg/L
St. Louis3.44 mg/L

Montana (1)

Billings1 mg/L

Nebraska (1)

Lincoln2.44 mg/L

Nevada (5)

Henderson0.82 mg/L
Las Vegas0.99 mg/L
North Las Vegas0.74 mg/L
Reno1.09 mg/L
Sparks1.09 mg/L

New Hampshire (1)

Nashua0.78 mg/L

New Jersey (14)

Clifton1.19 mg/L
East Orange1 mg/L
Elizabeth1.1 mg/L
Hoboken1.05 mg/L
Jersey City0.88 mg/L
New Brunswick1.11 mg/L
Newark2.67 mg/L
Passaic1.19 mg/L
Paterson1.19 mg/L
Perth Amboy2 mg/L
Trenton1.65 mg/L
Union City2.55 mg/L
Vineland1.22 mg/L
West New York2.55 mg/L

New Mexico (3)

Albuquerque1 mg/L
Rio Rancho0.6 mg/L
Santa Fe1.38 mg/L

New York (12)

Albany1.129 mg/L
Buffalo0.76 mg/L
Hempstead0.45–1.49 mg/L
Mount Vernon1.8 mg/L
New Rochelle0.7 mg/L
New York0.6 mg/L
Rochester0.87 mg/L
Syracuse0.72 mg/L
Troy0.79 mg/L
Utica1 mg/L
White Plains1.45 mg/L
Yonkers0.92 mg/L

North Carolina (10)

Cary2.96 mg/L
Charlotte1.04 mg/L
Concord1.06 mg/L
Durham1.5 mg/L
Fayetteville2.91 mg/L
Greensboro2.1 mg/L
High Point2.55 mg/L
Raleigh2.8 mg/L
Wilmington1.16 mg/L
Winston-Salem1.02 mg/L

North Dakota (3)

Bismarck2.5 mg/L
Fargo2.9 mg/L
Grand Forks2.8 mg/L

Ohio (4)

Akron1.2 mg/L
Cincinnati1.17 mg/L
Dayton1.29 mg/L
Toledo1.39 mg/L

Oklahoma (2)

Broken Arrow3 mg/L
Tulsa2.5 mg/L

Oregon (5)

Eugene0.19–0.73 mg/L
Gresham0.02–2.76 mg/L
Hillsboro1.51 mg/L
Portland1.96–1.98 mg/L
Salem1.07 mg/L

Pennsylvania (3)

Allentown0.91 mg/L
Philadelphia2.33 mg/L
Pittsburgh1.03 mg/L

Rhode Island (2)

Pawtucket0.96 mg/L
Providence0.49 mg/L

South Carolina (5)

Charleston3 mg/L
Columbia2.7 mg/L
Greenville2.3 mg/L
North Charleston3 mg/L
Rock Hill2.12 mg/L

South Dakota (1)

Sioux Falls2.63 mg/L

Tennessee (6)

Bartlett0.9108 mg/L
Chattanooga1.69 mg/L
Clarksville2 mg/L
Knoxville1.6 mg/L
Memphis0.86 mg/L
Nashville1.6 mg/L

Texas (62)

Abilene3.2 mg/L
Allen2.19 mg/L
Amarillo1.5958 mg/L
Arlington3.7 mg/L
Austin2.3 mg/L
Baytown2.75 mg/L
Brownsville3.25 mg/L
Bryan2.25 mg/L
Carrollton3.7 mg/L
College Station1.65 mg/L
Conroe0.97 mg/L
Corpus Christi3.33 mg/L
Dallas2.97 mg/L
Edinburg2.9 mg/L
El Paso1.99 mg/L
Euless2 mg/L
Flower Mound2.9 mg/L
Fort Worth3.3 mg/L
Frisco2.16 mg/L
Fulshear2.31 mg/L
Galveston2.1 mg/L
Garland2.48 mg/L
Georgetown3 mg/L
Grand Prairie2.95 mg/L
Grapevine2.94 mg/L
Harlingen3.7 mg/L
Houston2.8 mg/L
Irving2.84 mg/L
Killeen2.01 mg/L
Kyle1.43 mg/L
Laredo2.81 mg/L
League City2.39 mg/L
Little Elm2.1 mg/L
Longview2.78 mg/L
Lubbock3.511 mg/L
Mansfield4 mg/L
McAllen3.15 mg/L
McKinney2.22 mg/L
Mesquite2.15 mg/L
Midland2.44 mg/L
Mission2.54 mg/L
New Braunfels2.58 mg/L
Odessa3.45 mg/L
Pasadena2.5 mg/L
Pearland3.11 mg/L
Pflugerville1.6 mg/L
Pharr3.25 mg/L
Plano2.59 mg/L
Port Arthur3.28 mg/L
Richardson3.14 mg/L
Round Rock2.15 mg/L
Rowlett2.41 mg/L
San Angelo3 mg/L
San Antonio1.46 mg/L
San Marcos1.26 mg/L
Sugar Land2.74 mg/L
Temple2.89 mg/L
Texas City2.18 mg/L
Tyler1.96 mg/L
Victoria2.53 mg/L
Waco2.81 mg/L
Wylie3.225 mg/L

Utah (7)

Lehi0.2–0.8 mg/L
Murray0.09 mg/L
Orem0.05–1.3 mg/L
Salt Lake City0.64 mg/L
St. George0.1–1.23 mg/L
West Jordan0.56 mg/L
West Valley City0.9 mg/L

Virginia (9)

Alexandria3.1 mg/L
Chesapeake3.36 mg/L
Hampton3.3 mg/L
Newport News3.3 mg/L
Norfolk3.3 mg/L
Richmond3.8 mg/L
Roanoke0.86 mg/L
Suffolk3.24 mg/L
Virginia Beach3.03 mg/L

Washington (13)

Bellevue0.88 mg/L
Bellingham0.46 mg/L
Federal Way0.73 mg/L
Kennewick1.7 mg/L
Kent1.07 mg/L
Kirkland1.08 mg/L
Lacey0.89 mg/L
Pasco0.73 mg/L
Renton0.9 mg/L
Seattle1 mg/L
Tacoma0.27–1.66 mg/L
Vancouver0.5–1.2 mg/L
Yakima1.37 mg/L

Wisconsin (2)

Madison0.2–0.4 mg/L
Milwaukee1.61 mg/L

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