Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Idaho Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 324 ZIP codes across Idaho

Quick Summary: Is Tap Water Safe in Idaho?

Drinking water in Idaho receives an average composite safety score of 65.7/100 based on EPA Safe Drinking Water Act records. Approximately 4% of monitored ZIP codes earn an "A" grade. Water sources are 28.7% surface water and 71.3% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

324

Health Violations (5yr)

278

Statewide Avg Score

65.7/100

High Lead Risk Areas

48.1%

Overview: Drinking Water in Idaho

Drinking water quality in Idaho averages a composite safety score of 65.7/100 across its 324 monitored ZIP codes. Approximately 4% of ZIP codes in the state receive an "A" grade, while 1% receive an "F" grade. Environmental standards are enforced by Idaho Department of Environmental Quality.

Surface Water

28.7%

of ZIP codes

Total Violations

1,665

5-year record

Grade A ZIPs

4% of state

Grade F ZIPs

1% of state

Water Quality Grade Distribution in Idaho

How do Idaho's 324 ZIP codes stack up by water quality grade?

12 ZIP codes4%

130 ZIP codes40%

105 ZIP codes32%

74 ZIP codes23%

3 ZIP codes1%

City A-Z Directory — Idaho

Browse water quality reports for every town and city in Idaho.

Aberdeen Ahsahka Albion Almo American Falls Arbon Arco Arimo Ashton Athol Atlanta Atomic City Avery

Bancroft Banks Basalt Bayview Bellevue Bern Blackfoot Blanchard Bliss Bloomington Boise Bonners Ferry Bovill Bruneau Buhl Burley

Calder Caldwell Cambridge Carey Careywood Carmen Cascade Castleford Cataldo Challis Chester Clark Fork Clarkia Clayton Clifton Cobalt Cocolalla Coeur D Alene Colburn Conda Coolin Corral Cottonwood Council Craigmont Culdesac

Dayton Deary Declo Desmet Dietrich Dingle Donnelly Dover Downey Driggs Dubois

Eagle Eastport Eden Elk City Elk River Ellis Emmett

Fairfield Felt Fenn Ferdinand Fernwood Filer Firth Fish Haven Fort Hall Franklin Fruitland

Garden City Garden Valley Genesee Geneva Georgetown Gibbonsville Glenns Ferry Gooding Grace Grand View Grangeville Greencreek Greenleaf

Hagerman Hailey Hamer Hammett Hansen Harrison Harvard Hayden Hazelton Heyburn Hill City Holbrook Homedale Hope Horseshoe Bend Howe Huston

Idaho City Idaho Falls Indian Valley Inkom Iona Irwin Island Park

Jerome Juliaetta

Kamiah Kellogg Kendrick Ketchum Kimberly King Hill Kingston Kooskia Kootenai Kuna

Laclede Lake Fork Lapwai Lava Hot Springs Leadore Lemhi Lenore Letha Lewiston Lewisville Lowman Lucile

Nampa Naples New Meadows New Plymouth Newdale Nezperce Nordman North Fork Notus

Oakley Ola Oldtown Orofino Osburn

Paris Parker Parma Paul Payette Peck Picabo Pierce Pinehurst Pingree Placerville Plummer Pocatello Pollock Ponderay Porthill Post Falls Potlatch Preston Priest River Princeton

Rathdrum Reubens Rexburg Richfield Rigby Riggins Ririe Roberts Rockland Rogerson Rupert

Tendoy Tensed Terreton Teton Tetonia Thatcher Troy Twin Falls

Ucon

Victor Viola

Wallace Warren Wayan Weippe Weiser Wendell Weston White Bird Wilder Winchester Worley

Yellow Pine

🏆 Highest Rated ZIP Codes in Idaho

⚠ Lowest Rated ZIP Codes in Idaho

Common Drinking Water Contaminants in Idaho

The following are common regulated contaminants found in Idaho drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Stage 2 DBP RuleCombined RadiumConsumer Confidence Report RuleContaminant 0700BariumStage 1 DBP RuleTotal Trihalomethanes (TTHM)Chlorite

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Idaho Drinking Water

Is tap water generally safe to drink in Idaho?+

Yes, for the majority of residents, tap water in Idaho is treated and regulated. However, compliance varies by city. State-wide, 12 ZIP codes receive an "A" grade, while 3 receive an "F". Search your specific ZIP code to see your local utility's record.

How do I test water quality or well water in Idaho?+

Residents in Idaho can test their tap or well water by contacting laboratories certified by Idaho Department of Environmental Quality or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.

What are the biggest water quality issues in Idaho?+

The primary issues include managing 278 health-based violations state-wide and resolving infrastructure age. 48.1% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.

Who regulates and enforces drinking water standards in Idaho?+

Drinking water in Idaho is regulated by Idaho Department of Environmental Quality under a primacy agreement with the U.S. EPA.

Where does Idaho get its drinking water?+

Approximately 28.7% of monitored areas in Idaho rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.

How do I find the official water quality report for my home in Idaho?+

Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).

View All 324 ZIP Codes in Idaho

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

83201 83202 83203 83204 83205 83206 83209 83210 83211 83212 83213 83214 83215 83217 83218 83220 83221 83223 83226 83227 83228 83229 83230 83232 83233 83234 83235 83236 83237 83238 83239 83241 83243 83244 83245 83246 83250 83251 83252 83253 83254 83255 83256 83261 83262 83263 83271 83272 83274 83276 83277 83278 83281 83283 83285 83286 83287 83301 83302 83303 83311 83312 83313 83314 83316 83318 83320 83321 83322 83323 83324 83325 83327 83328 83330 83332 83333 83334 83335 83336 83337 83338 83340 83341 83342 83343 83344 83346 83347 83348 83349 83350 83352 83353 83354 83355 83401 83402 83403 83404 83405 83406 83415 83420 83421 83422 83423 83424 83425 83427 83428 83429 83431 83433 83434 83435 83436 83438 83440 83441 83442 83443 83444 83445 83446 83448 83449 83450 83451 83452 83454 83455 83460 83462 83463 83464 83465 83466 83467 83468 83469 83501 83520 83522 83523 83524 83525 83526 83530 83531 83533 83535 83536 83537 83539 83540 83541 83542 83543 83544 83545 83546 83547 83548 83549 83552 83553 83554 83555 83601 83602 83604 83605 83606 83607 83610 83611 83612 83615 83616 83617 83619 83622 83623 83624 83626 83627 83628 83629 83630 83631 83632 83633 83634 83635 83636 83637 83638 83639 83641 83642 83643 83644 83645 83646 83647 83648 83650 83651 83652 83653 83654 83655 83656 83657 83660 83661 83666 83669 83670 83671 83672 83676 83677 83680 83686 83687 83701 83702 83703 83704 83705 83706 83707 83708 83709 83711 83712 83713 83714 83715 83716 83717 83719 83720 83721 83722 83724 83725 83726 83727 83728 83729 83730 83731 83732 83735 83756 83757 83799 83801 83802 83803 83804 83805 83806 83808 83809 83810 83811 83812 83813 83814 83815 83816 83821 83822 83823 83824 83825 83826 83827 83830 83832 83833 83834 83835 83836 83837 83839 83840 83841 83842 83843 83844 83845 83846 83847 83848 83849 83850 83851 83852 83853 83854 83855 83856 83857 83858 83860 83861 83864 83865 83866 83867 83868 83869 83870 83871 83872 83873 83874 83876 83877

All 324 ZIP codes in Idaho are actively monitored under the EPA Safe Drinking Water Act.