Idaho Tap Water Quality: Is It Safe to Drink?

2026 EPA water quality data for 767 community water systems serving a combined 1,566,791 people in Idaho. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.

Idaho relies predominantly on groundwater from the Snake River Plain Aquifer for drinking water supply. Naturally occurring arsenic and nitrate from agricultural runoff are the most common contaminants of concern. Water is generally very hard across southern Idaho, often exceeding 180 mg/L.

Find Your Water System in Idaho

Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.

📊 Data from EPA’s SDWIS · 🔄 Updated quarterly · 🏛️ 767 water systems in Idaho

Showing the 250 largest of 767 community water systems in Idaho, by population served. Use the ZIP search above or the city links to find a smaller system.

VEOLIA WATER IDAHO BOISE, ID · 264,978 people · Surface Water MERIDIAN WATER DEPT MERIDIAN, ID · 147,340 people · Groundwater NAMPA CITY OF NAMPA, ID · 100,200 people · Groundwater CALDWELL CITY OF CALDWELL, ID · 74,000 people · Groundwater IDAHO FALLS CITY OF IDAHO FALLS, ID · 69,450 people · Groundwater POCATELLO CITY OF POCATELLO, ID · 58,231 people · Groundwater TWIN FALLS CITY OF TWIN FALLS, ID · 56,121 people · Groundwater COEUR D ALENE CITY OF COEUR D ALENE, ID · 54,115 people · Groundwater REXBURG CITY OF REXBURG, ID · 39,790 people · Groundwater KUNA CITY OF KUNA, ID · 32,038 people · Groundwater MOSCOW WATER DEPT MOSCOW, ID · 26,000 people · Groundwater FALLS WATER COMPANY INC IDAHO FALLS, ID · 22,650 people · Groundwater POST FALLS CITY OF POST FALLS, ID · 20,285 people · Groundwater LEWISTON ORCHARDS IRRIGATION DIST LEWISTON, ID · 20,000 people · Groundwater AMMON CITY OF AMMON, ID · 17,338 people · Groundwater CHUBBUCK CITY OF CHUBBUCK, ID · 15,842 people · Groundwater LEWISTON CITY OF LEWISTON, ID · 15,001 people · Surface Water MOUNTAIN HOME, CITY OF MOUNTAIN HOME, ID · 14,651 people · Groundwater STAR SEWER AND WATER DIST WATER SYSTEM STAR, ID · 14,000 people · Groundwater BLACKFOOT CITY OF BLACKFOOT, ID · 13,224 people · Groundwater MIDDLETON CITY OF MIDDLETON, ID · 13,190 people · Groundwater JEROME CITY OF JEROME, ID · 13,135 people · Groundwater GARDEN CITY WATER AND SEWER SYSTEM GARDEN CITY, ID · 12,500 people · Groundwater SANDPOINT PUBLIC WORKS DEPT SANDPOINT, ID · 12,284 people · Surface Water EAST GREENACRES IRRIGATION DIST POST FALLS, ID · 11,165 people · Groundwater RATHDRUM CITY OF RATHDRUM, ID · 10,358 people · Groundwater BURLEY WATER DEPT BURLEY, ID · 10,345 people · Groundwater HAYDEN LAKE IRRIGATION DIST HAYDEN, ID · 9,375 people · Groundwater CAPITOL WATER CORP BOISE, ID · 9,000 people · Groundwater ROSS POINT WATER DIST POST FALLS, ID · 8,965 people · Groundwater AVONDALE IRRIGATION DIST HAYDEN, ID · 8,785 people · Groundwater UNIVERSITY OF IDAHO MOSCOW, ID · 8,589 people · Groundwater PAYETTE CITY OF PAYETTE, ID · 8,127 people · Groundwater HAILEY WATER AND SEWER HAILEY, ID · 8,000 people · Groundwater MOUNTAIN HOME AIR FORCE BASE MOUNTAIN HOME AFB, ID · 7,500 people · Groundwater FRUITLAND CITY OF FRUITLAND, ID · 7,135 people · Surface Water EMMETT CITY OF EMMETT, ID · 6,700 people · Groundwater EAGLE, CITY OF (WESTERN ZONE) EAGLE, ID · 6,108 people · Groundwater CENTRAL SHOSHONE COUNTY WATER DIST KELLOGG, ID · 6,098 people · GWUDI RUPERT CITY OF RUPERT, ID · 5,796 people · Groundwater WEISER CITY OF WEISER, ID · 5,630 people · Surface Water PRESTON CITY OF PRESTON, ID · 5,591 people · Groundwater RIGBY CITY OF RIGBY, ID · 5,400 people · Groundwater KIMBERLY CITY OF KIMBERLY, ID · 5,359 people · Groundwater AMERICAN FALLS CITY OF AMERICAN FALLS, ID · 4,863 people · Groundwater BUHL CITY OF BUHL, ID · 4,518 people · Groundwater MCCALL CITY OF MCCALL, ID · 4,423 people · Surface Water SHELLEY CITY OF SHELLEY, ID · 4,409 people · Groundwater ST MARIES CITY OF ST MARIES, ID · 4,173 people · Surface Water HILLSIDE SERVICE AREA RATHDRUM, ID · 4,140 people · Groundwater GOODING CITY OF GOODING, ID · 3,706 people · Groundwater EAGLE, CITY OF (EASTERN ZONE) EAGLE, ID · 3,702 people · Groundwater ST ANTHONY ST ANTHONY, ID · 3,606 people · Groundwater KETCHUM CITY OF KETCHUM, ID · 3,555 people · Groundwater RIMROCK SERVICE AREA RATHDRUM, ID · 3,493 people · Groundwater SUN VALLEY WATER AND SEWER DIST SUN VALLEY, ID · 3,400 people · Groundwater BONNERS FERRY CITY OF BONNERS FERRY, ID · 3,367 people · Surface Water IDOC SBX COMPLEX BOISE, ID · 3,309 people · Groundwater SALMON CITY OF SALMON, ID · 3,158 people · Surface Water GRANGEVILLE WATER DEPT GRANGEVILLE, ID · 3,151 people · Groundwater SODA SPRINGS CITY OF SODA SPRINGS, ID · 3,111 people · Groundwater WENDELL CITY OF WENDELL, ID · 3,000 people · Groundwater HEYBURN CITY OF HEYBURN, ID · 3,000 people · Groundwater HOMEDALE CITY OF HOMEDALE, ID · 2,999 people · Groundwater FILER WATER WORKS FILER, ID · 2,858 people · Groundwater SPIRIT LAKE CITY OF SPIRIT LAKE, ID · 2,825 people · Groundwater MONTPELIER CITY OF MONTPELIER, ID · 2,772 people · Groundwater BELLEVUE CITY OF BELLEVUE, ID · 2,747 people · Groundwater IONA WATER DEPT IONA, ID · 2,717 people · Groundwater DALTON WATER ASSN INC DALTON GARDENS, ID · 2,598 people · Groundwater OROFINO CITY OF OROFINO, ID · 2,459 people · Surface Water THREE MILE WATER DIST BONNERS FERRY, ID · 2,458 people · Groundwater SUGAR CITY CITY OF SUGAR CITY, ID · 2,395 people · Groundwater E SHOSHONE COUNTY WATER DIST WALLACE WALLACE, ID · 2,388 people · Surface Water VICTOR CITY OF VICTOR, ID · 2,361 people · Groundwater CABINET MOUNTAINS WATER DIST BONNERS FERRY, ID · 2,335 people · Groundwater PARMA CITY OF WILDER, ID · 2,250 people · Groundwater IDOC IDAHO STATE CORRECTIONAL CENTER BOISE, ID · 2,204 people · Groundwater MALAD CITY OF MALAD, ID · 2,200 people · Groundwater DRIGGS CITY OF DRIGGS, ID · 2,200 people · Groundwater PRIEST RIVER CITY OF PRIEST RIVER, ID · 2,173 people · Surface Water ABERDEEN CITY OF ABERDEEN, ID · 2,088 people · Groundwater TWIN LAKES SERVICE AREA RATHDRUM, ID · 2,023 people · Groundwater RIVERSIDE WATER AND SEWER DISTRICT OROFINO, ID · 2,000 people · Surface Water PINEHURST WATER DIST PINEHURST, ID · 1,950 people · Groundwater WILDER CITY OF WILDER, ID · 1,690 people · Groundwater NEW PLYMOUTH CITY OF NEW PLYMOUTH, ID · 1,600 people · Groundwater HAUSER LAKE WATER ASSN INC HAUSER, ID · 1,575 people · Groundwater ODEN WATER ASSN INC SANDPOINT, ID · 1,524 people · Surface Water COMORE LOMA IDAHO FALLS, ID · 1,500 people · Groundwater KAMIAH CITY OF KAMIAH, ID · 1,495 people · Surface Water SHOSHONE WATER WORKS SHOSHONE, ID · 1,398 people · Groundwater BAYVIEW WATER AND SEWER DIST BAYVIEW, ID · 1,320 people · Groundwater MARSING CITY OF MARSING, ID · 1,300 people · Groundwater FAIRVIEW WATER DIST PRESTON, ID · 1,300 people · Groundwater GLENNS FERRY CITY OF GLENNS FERRY, ID · 1,282 people · Surface Water HANSEN CITY OF HANSEN, ID · 1,200 people · Groundwater PAUL CITY OF PAUL, ID · 1,195 people · Groundwater HAYDEN PINES GROUSE MEADOWS RATHDRUM, ID · 1,188 people · Groundwater UCON CITY OF UCON, ID · 1,161 people · Groundwater ASHTON CITY OF ASHTON, ID · 1,129 people · Groundwater DRY CREEK WATER COMPANY LLC EAGLE, ID · 1,125 people · Groundwater MOYIE SPRINGS CITY OF MOYIE SPRINGS, ID · 1,123 people · Groundwater REMINGTON REC WATER DIST ATHOL, ID · 1,104 people · Groundwater CALDWELL HOUSING AUTHORITY CALDWELL, ID · 1,100 people · Groundwater ARCO CITY OF ARCO, ID · 1,080 people · Groundwater GENESEE CITY OF GENESEE, ID · 1,044 people · Groundwater PLUMMER CITY OF PLUMMER, ID · 1,034 people · Groundwater BLACK ROCK UTILITIES INC HAYDEN, ID · 1,014 people · Groundwater CASCADE CITY OF CASCADE, ID · 1,000 people · Groundwater FRANKLIN CITY OF FRANKLIN, ID · 1,000 people · GWUDI CAREY WATER AND SEWER CAREY, ID · 993 people · Groundwater ATHOL CITY OF ATHOL, ID · 990 people · Groundwater HAGERMAN CITY OF HAGERMAN, ID · 988 people · Groundwater GREENFERRY WATER & SEWER DISTRICT HAYDEN, ID · 978 people · Groundwater COTTONWOOD WATER DEPT COTTONWOOD, ID · 977 people · Groundwater SCHWEITZER BASIN WATER COMPANY SAGLE, ID · 955 people · Groundwater STONERIDGE UTILITIES BLANCHARD, ID · 940 people · Groundwater TETON SPRINGS WATER AND SEWER COMPANY DRIGGS, ID · 924 people · Groundwater GRACE CITY OF GRACE, ID · 920 people · Groundwater COUNCIL CITY OF COUNCIL, ID · 900 people · Groundwater CHALLIS CITY OF CHALLIS, ID · 900 people · Surface Water HAZELTON CITY OF HAZELTON, ID · 899 people · Groundwater DOVER CITY OF DOVER, ID · 865 people · Surface Water TROY CITY OF TROY, ID · 850 people · Surface Water GREENLEAF CITY OF GREENLEAF, ID · 846 people · Groundwater KOOTENAI COUNTY WATER DIST 1 COEUR D'ALENE, ID · 843 people · Surface Water GEM STATE - SPIRIT LAKE EAST COEUR D'ALENE, ID · 843 people · Groundwater E SHOSHONE COUNTY WATER DIST MULLAN WALLACE, ID · 840 people · Surface Water OAKLEY CITY OF OAKLEY, ID · 821 people · Groundwater POTLATCH CITY OF POTLATCH, ID · 812 people · Groundwater MEADOW CREEK PROPERTY OWNERS ASSN INC NEW MEADOWS, ID · 800 people · Groundwater HILLSDALE ESTATES HOMEOWNERS ASSN BOISE, ID · 800 people · Groundwater MCCAMMON CITY OF MCCAMMON, ID · 800 people · Groundwater INKOM CITY OF INKOM, ID · 792 people · Groundwater HORSESHOE BEND WATER SUPPLY HORSESHOE BEND, ID · 750 people · Surface Water TETON CITY OF TETON, ID · 735 people · Groundwater CLARK FORK CITY OF CLARK FORK, ID · 730 people · Groundwater SAGLE VALLEY WATER DIST COEUR D'ALENE, ID · 708 people · Groundwater CATALDO WATER DIST KINGSTON, ID · 680 people · Groundwater 3D WATER ASSOCIATION UCONN, ID · 680 people · Groundwater ROBERTS CITY OF ROBERTS, ID · 680 people · Groundwater LACLEDE WATER DIST SANDPOINT, ID · 668 people · Surface Water RIRIE CITY OF RIRIE, ID · 656 people · Groundwater DESERT VIEW ESTATES WATER CORP KUNA, ID · 650 people · Groundwater MELBA CITY OF MELBA, ID · 648 people · Groundwater GEM STATE - BAR CIRCLE S RANCH COEUR D'ALENE, ID · 633 people · Groundwater DOWNEY CITY OF DOWNEY, ID · 625 people · Groundwater JULIAETTA CITY OF JULIAETTA, ID · 624 people · Surface Water SOUTHSIDE WATER AND SEWER DIST SANDPOINT, ID · 615 people · Groundwater KOOSKIA WATER DEPT KOOSKIA, ID · 607 people · Groundwater TAYLOR MOUNTAIN WATER AND SEWER DISTRICT IDAHO FALLS, ID · 600 people · Groundwater WORLEY CITY OF WORLEY, ID · 591 people · Groundwater KINGSTON WATER DIST 1 KINGSTON, ID · 585 people · Groundwater NEW MEADOWS CITY OF NEW MEADOWS, ID · 582 people · Groundwater FERNWOOD WATER DIST FERNWOOD, ID · 580 people · Surface Water MACKAY CITY OF MACKAY, ID · 566 people · Groundwater CHILCO SERVICE AREA RATHDRUM, ID · 563 people · Groundwater SYRINGA HEIGHTS WATER DIST SANDPOINT, ID · 550 people · Surface Water Purchased MEADOWS AT WEST MOUNTAIN MERIDIAN, ID · 550 people · Groundwater WEST BONNER WATER DIST 1 OLD TOWN, ID · 545 people · Groundwater RUSTIC ACRES MOBILE HOME PARK BOISE, ID · 540 people · Groundwater NOTUS CITY OF NOTUS, ID · 539 people · Groundwater PARIS CITY OF PARIS, ID · 535 people · Groundwater BEE LINE WATER ASSN INC BONNERS FERRY, ID · 533 people · Surface Water DEARY CITY OF DEARY, ID · 529 people · Groundwater WILDERNESS RANCH OWNERS ASSOCIATION INC BOISE, ID · 525 people · Surface Water FIRTH CITY OF FIRTH, ID · 511 people · Groundwater DUBOIS CITY OF DUBOIS, ID · 511 people · Groundwater DAYTON CITY OF DAYTON, ID · 510 people · Groundwater CRAIGMONT CITY OF CRAIGMONT, ID · 501 people · Groundwater RICHFIELD CITY OF RICHFIELD, ID · 501 people · Groundwater PINE VILLA PARK AND WATER ASSN POST FALLS, ID · 500 people · Groundwater OAKLEY VALLEY WATER CORPORATION OAKLEY, ID · 500 people · Groundwater CITY OF EAGLE - VALNOVA EAGLE, ID · 490 people · Groundwater CITY OF EAGLE - AVIMOR EAGLE, ID · 490 people · Groundwater WESTON CITY OF WESTON, ID · 490 people · Groundwater EMERALD ESTATES WATER ASSN INC COEUR D ALENE, ID · 485 people · Groundwater HOLIDAY ACRES WATER ASSN SPIRIT LAKE, ID · 480 people · Groundwater RED PHEASANT WATER COMPANY LLC LEWISTON, ID · 480 people · Groundwater IDAHO CITY WATER DEPT IDAHO CITY, ID · 478 people · Surface Water GEORGETOWN CITY OF GEORGETOWN, ID · 476 people · Groundwater TERRACE LAKES WATER COMPANY NEW PLYMOUTH, ID · 475 people · Groundwater GOZZER RANCH RATHDRUM, ID · 470 people · Surface Water PIERCE CITY OF PIERCE, ID · 467 people · Surface Water NEZPERCE WATER DEPT NEZPERCE, ID · 460 people · Groundwater MORNING VIEW WATER COMPANY IDAHO FALLS, ID · 459 people · Groundwater CAVE BAY COMMUNITY SYSTEM WORLEY, ID · 458 people · Groundwater HARRISON CITY OF PLUMMER, ID · 456 people · Groundwater IDOC MOUNTAIN VIEW TRANSFORMATION CENTER BOISE, ID · 456 people · Groundwater GRAND VIEW, CITY OF GRAND VIEW, ID · 452 people · Groundwater PINEVIEW ESTATES WATER DIST ATHOL, ID · 450 people · Groundwater MID VALLEY WATER COMPANY LLC HAILEY, ID · 450 people · Groundwater PINEWOOD ESTATES OREM, UT · 450 people · Groundwater COUNTRY SQUIRE ESTATES RIGBY, ID · 450 people · Groundwater LONE MOUNTAIN ESTATES HAYDEN, ID · 448 people · Groundwater EAST HOPE WATER DEPT HOPE, ID · 445 people · Surface Water MOUNTAIN VIEW TERRACE RATHDRUM, ID · 445 people · Groundwater FAIRFIELD CITY OF FAIRFIELD, ID · 441 people · Groundwater WEIPPE CITY OF WEIPPE, ID · 438 people · Groundwater RIGGINS CITY OF RIGGINS, ID · 434 people · Groundwater FLYING H TRAILER RANCH BOISE, ID · 430 people · Groundwater GEM STATE - BITTERROOT WATER COMPANY COEUR D'ALENE, ID · 428 people · Groundwater NORTH IDAHO CORRECTIONAL INSTITUTE COTTONWOOD, ID · 425 people · Groundwater BASALT CITY OF SUGAR CITY, ID · 425 people · Groundwater NORTHSIDE WATER USERS ASSN SANDPOINT, ID · 413 people · Surface Water Purchased CLIFTON CITY OF CLIFTON, ID · 413 people · Groundwater EDEN CITY OF EDEN, ID · 411 people · Groundwater TETONIA CITY OF TETONIA, ID · 409 people · Groundwater WHITNEY NASHVILLE WATER WORKS PRESTON, ID · 403 people · Groundwater WINCHESTER WATER DEPT WINCHESTER, ID · 400 people · Groundwater FISH HAVEN PIPELINE COMPANY FISH HAVEN, ID · 400 people · Groundwater GARWOOD WATER COOP HAYDEN, ID · 398 people · Groundwater PINE RIDGE WATER AND SEWER DIST KAMIAH, ID · 390 people · Surface Water Purchased HULEN MEADOWS WATER COMPANY KETCHUM, ID · 390 people · Groundwater LAVA HOT SPRINGS CITY OF LAVA HOT SPRINGS, ID · 386 people · Groundwater BLISS CITY OF BLISS, ID · 384 people · Groundwater CULDESAC CITY OF CULDESAC, ID · 382 people · Groundwater LEISURE PARK COEUR D ALENE, ID · 381 people · Groundwater SHALIMAR SUBD NAMPA, ID · 370 people · Groundwater J AND K WATER CORP IDAHO FALLS, ID · 370 people · Groundwater ARIMO CITY OF ARIMO, ID · 368 people · Groundwater TROY HOFFMAN WATER CORP COEUR D'ALENE, ID · 367 people · Groundwater MORELAND WATER AND SEWER DISTRICT MORELAND, ID · 364 people · Groundwater HUCKLEBERRY BAY WATER SYSTEM COOLIN, ID · 362 people · Groundwater M AND T WATER AND SEWER DIST MONTEVIEW, ID · 358 people · Groundwater HARBOR VIEW ESTATES WATER & SEWER DIST COEUR D ALENE, ID · 355 people · Surface Water BELLE AIRE ACRES 2 NAMPA, ID · 350 people · Groundwater UNIT 3 WATER ASSN JEROME, ID · 350 people · Groundwater BANCROFT CITY OF BANCROFT, ID · 350 people · Groundwater NEWDALE CITY OF NEWDALE, ID · 340 people · Groundwater MOUNTAIN SPRINGS WATER CORPORATION SAGLE, ID · 338 people · Groundwater PEPPERWOOD CROSSING/ROCKY MNT UTILITIES RIGBY, ID · 336 people · Groundwater CAMBRIDGE CITY OF CAMBRIDGE, ID · 335 people · Groundwater DIETRICH WATER SYSTEM DIETRICH, ID · 332 people · Groundwater VP, INC SANDPOINT, ID · 327 people · Groundwater LAPWAI CITY OF LAPWAI, ID · 325 people · Groundwater ALBION CITY OF ALBION, ID · 325 people · Groundwater PARKER CITY OF PARKER, ID · 322 people · Groundwater ELK CITY WATER AND SEWER ASSN ELK CITY, ID · 320 people · Surface Water LANSING MEADOWS MIDDLETON, ID · 320 people · Groundwater TRAVEL AMERICA TRAILER PARK SANDPOINT SAGLE, ID · 318 people · Groundwater Purchased KENDRICK CITY OF KENDRICK, ID · 313 people · Groundwater CONKLING PARK WATER ASSN WORLEY, ID · 309 people · Groundwater MOUNTAIN VIEW WATER AND ROAD ASSN GARDEN VALLEY, ID · 305 people · Groundwater IDAHO CLUB SANDPOINT, ID · 300 people · Groundwater ROSE LAKE WATER ASSN CATALDO, ID · 300 people · Groundwater EL RANCHO HEIGHTS CALDWELL, ID · 300 people · Groundwater LAKEYS CAFE AND TRAILER PARK BOISE, ID · 300 people · Groundwater EAGLE GLEN HOMEOWNERS ASSN INC BOISE, ID · 300 people · Groundwater

Idaho Drinking Water: Frequently Asked Questions

Is Idaho tap water safe to drink?

Idaho has 767 community water systems regulated by the EPA serving a combined 1,566,791 people. Water quality varies by system — search above to find your specific utility and see its violation history, lead test results, and safety grade.

How many water systems are in Idaho?

There are 767 EPA-regulated community water systems in Idaho serving a combined 1,566,791 people. Each system is required to test for over 90 contaminants and publicly report any violations.

Does Idaho have PFAS in its drinking water?

PFAS (forever chemicals) have been detected in water systems across the country, including Idaho. The EPA finalized enforceable PFAS limits in 2024. Search for your specific water system above to see if PFAS were detected and whether levels exceed the new federal limits.

EPA data last updated: 2026-07-12