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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
EPA records for MOUNTAIN HOME, CITY OF • Updated October 2026
Grade C — based on EPA compliance records, lead testing and PFAS monitoring
MOUNTAIN HOME, CITY OF has a mixed record — read the reasons below; the deductions come from real EPA violations, lead results or PFAS detections, not from a template.
Mountain Home, ID tap water is legal to drink but grades C on EPA's records, mainly because of 2 health-based EPA violations in the last five years. A certified filter matched to that finding is a reasonable precaution.
Mountain Home, ID tap water is legal to drink but grades C on EPA's records, mainly because of 2 health-based EPA violations in the last five years. A certified filter matched to that finding is a reasonable precaution.
MOUNTAIN HOME, CITY OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 522 UCMR5 PFAS results for MOUNTAIN HOME, CITY OF (2023-11-28 to 2025-10-17) were at or above the reporting limit of roughly 3–5 ppt.
MOUNTAIN HOME, CITY OF has 152 violations on file since 2016: 2 health-based in the last five years and 146 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
MOUNTAIN HOME, CITY OF reports groundwater as its primary source and serves about 14,651 people (EPA PWSID ID4200032).
We recommend one. Check which contaminant the violations involved (table above) and choose a filter certified for it.
Compare filter options for your Mountain Home tap water
MOUNTAIN HOME, CITY OF has 2 health-based EPA violations in the last five years.
See the filters matched to Mountain Home's EPA results → — which certification actually removes what was found here, and what it does not touch.
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MOUNTAIN HOME, CITY OF · SDWIS records since 2016 · 5-year window starts 2021-09-13
EPA records 2 health-based violations for this system in the last five years, all of which are marked resolved or archived. Health-based violations mean a contaminant exceeded its Maximum Contaminant Level (MCL) or a required treatment step was not met.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| Treatment Technique, Level 1 Assessment (RTCR)Revised Total Coliform Rule | Treatment technique | 2025-08-01 | Resolvedreturned 2025-12-11 |
| LSL InventoryLEAD AND COPPER RULE REVISIONS | Treatment technique | 2024-10-17 | Resolvedreturned 2025-01-23 |
| LSL ReportingLEAD AND COPPER RULE REVISIONS | Reporting | 2024-10-17 | Resolvedreturned 2025-01-23 |
| Monitoring, Source Water (GWR)E. COLI | Monitoring & reporting | 2024-09-30 | Unaddressed |
| Monitoring, Source Water (GWR)E. COLI | Monitoring & reporting | 2024-07-22 | Unaddressed |
| Monitoring, RegularBHC-GAMMA | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularToxaphene | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularGlyphosate | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularDi(2-ethylhexyl) adipate | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularSimazine | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularDinoseb | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularCarbofuran | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularHEXACHLOROBENZENE | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularBenzo(a)pyrene | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularTotal Polychlorinated Biphenyls (PCB) | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularChlordane | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularMethoxychlor | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularDalapon | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularGlyphosate | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularOXAMYL | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularSimazine | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularDi(2-ethylhexyl) phthalate | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularPicloram | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularAtrazine | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
| Monitoring, RegularLASSO | Monitoring & reporting | 2023-01-01 → 2025-12-31 | Archived |
Showing 25 of 152 violations on file. Full record on EPA ECHO.
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA Lead and Copper Rule 90th-percentile results reported by MOUNTAIN HOME, CITY OF
Well below the 15 ppb action level. In the most recent monitoring period on file (2023-01-01 to 2025-12-31), 90% of the homes MOUNTAIN HOME, CITY OF sampled had lead at or below 0 ppb.
EPA's action level is 15 ppb (dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements). There is no safe level of lead; the 90th-percentile figure describes the system, not your tap — homes with lead service lines or pre-1986 plumbing can be higher.
| Monitoring period | Lead 90th percentile | vs 15 ppb action level |
|---|---|---|
| 2023-01-01 → 2025-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2022-07-01 → 2022-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2022-01-01 → 2022-06-30 | 0 ppb | Well below the 15 ppb action level |
| 2019-01-01 → 2021-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2016-01-01 → 2018-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2013-01-01 → 2015-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2010-01-01 → 2012-12-31 | 5 ppb | Below the action level, but detectable |
| 2007-01-01 → 2009-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2004-01-01 → 2006-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2001-01-01 → 2003-12-31 | 0 ppb | Well below the 15 ppb action level |
| 1998-01-01 → 2000-12-31 | 0 ppb | Well below the 15 ppb action level |
| 1995-01-01 → 1997-12-31 | 5 ppb | Below the action level, but detectable |
Source: ECHO SDWA bulk download (SDWA_LCR_SAMPLES.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA UCMR5 monitoring, 2023-11-28 to 2025-10-17 · 522 PFAS results at entry points to the distribution system
No PFAS detected. None of the 522 UCMR5 PFAS results for MOUNTAIN HOME, CITY OF were at or above the method reporting limit. Reporting limits are about 3–5 ppt, so “not detected” means below that threshold — not proven zero.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 18 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 18 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 18 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 18 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 18 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 18 | < 3 | 3 ppt | hazard index only |
“< 4 ppt” means below the laboratory reporting limit, not zero. ppt = parts per trillion (ng/L). Results are for finished water leaving the treatment plant.
What PFAS are and how to remove them →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for MOUNTAIN HOME, CITY OF · finished water only · dated data, released 2024
These are the regulated-contaminant samples MOUNTAIN HOME, CITY OF reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Every scored contaminant stayed within its Maximum Contaminant Level (MCL) and averaged below 80% of the limit. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Arsenic | 128 detects | 2.683 µg/L | 6.5 µg/L | 10 µg/LMCL | Within MCL |
| Nitrate (as N) | 68 | 1.188 mg/L | 2.3 mg/L | 10 mg/LMCL | Within MCL |
| Fluoride | 14 | 0.587 mg/L | 1.79 mg/L | 4 mg/LMCL | Within MCL |
| Chromium (total) | 128 detects | 2.083 µg/L | 4 µg/L | 100 µg/LMCL | Within MCL |
| Uranium (combined) | 193 detects | 0.211 µg/L | 2 µg/L | 30 µg/LMCL | Within MCL |
| Radium-226/228 | 122 detects | 0.084 pCi/L | 0.66 pCi/L | 5 pCi/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 6022 detects | 1.372 µg/L | 14 µg/L | 80 µg/LMCL (LRAA) | Within MCL |
| Haloacetic acids (HAA5) | 603 detects | 0.112 µg/L | 3.4 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
Averages count non-detects as zero. TTHM and HAA5 limits are locational running annual averages, so a single high sample is not a violation — we grade those on the average only. Lead and copper rows are individual tap samples and are shown for context; compliance (and our score) uses the 90th-percentile result above. LRAA = locational running annual average; ND = not detected.
Source: SYR4 Six-Year Review compliance monitoring data 2012–2019 (released 2024-03)
A point-of-use (under-sink) system typically runs $200-$600 installed; whole-house treatment $1,000-$3,000+ depending on flow and what has to come out. Tell us where you are and a certified water-treatment installer serving Mountain Home will follow up - no obligation.
MOUNTAIN HOME, CITY OF · 5,842 service lines inventoried · Q2 2026 snapshot
MOUNTAIN HOME, CITY OF reports no lead or galvanized-requiring-replacement service lines and has classified 100% of its 5,842 lines as non-lead. Lead can still come from pre-1986 plumbing and fixtures inside a home.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID ID4200032 · See all Idaho lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Groundwater systems draw from wells; naturally occurring arsenic, nitrate, radium and uranium are the readings to watch, along with PFAS near industrial or military sites.
How to test your tap water and the treatment options that actually fit Mountain Home homes
The most reliable way to know what is actually coming out of your tap is a certified mail-in lab test. City-wide EPA data (like the report above) reflects the water leaving the treatment plant, but contaminants such as lead and copper can be picked up from your own service line and household plumbing — so the water at your Mountain Home faucet can differ from the system average. A state-certified lab measures dozens of contaminants at once with results you can trust; you can also find one near you through the EPA's certified-lab list at epa.gov/dwlabcert. Hardware-store test strips are cheaper and instant, but they only screen for a few basics (chlorine, hardness, pH, and a rough lead pass/fail) and are far less accurate — treat them as a first look, not a diagnosis.
Match the treatment to what your test finds. Reverse osmosis (RO) removes the widest range of contaminants — lead, arsenic, nitrate, PFAS, and dissolved solids — which makes an under-sink reverse osmosis system the most thorough choice for Mountain Home households with heavy-metal or PFAS concerns. If your main issue is taste, odor, or chlorine, an activated carbon filter (pitcher, faucet, or under-sink) is simpler and cheaper and handles chlorine and many organic compounds well, though carbon alone does not remove arsenic, nitrate, or most PFAS. NSF-certified pitchers rated for lead reduction are the easiest way to start today while you decide on a permanent setup.
We may earn a commission from testing kits and filters purchased through these links, at no extra cost to you.
What Mountain Home residents measured at their own tap (ZIPs 83647). All reader results →
Reader submissions are unverified and shown separately from EPA data. They reflect one tap on one day, not the utility's compliance record.
No reader results for Mountain Home yet - yours would be the first. A hardness or TDS number from a $10 strip kit is enough to start the map.
Help build the first reader-sourced water map. Enter whatever your test strip, TDS pen or lab report shows - one number is enough.
Mountain Home ranks #19 of 20 graded Idaho cities.
Mountain Home, ID tap water is legal to drink but grades C on EPA's records, mainly because of 2 health-based EPA violations in the last five years. A certified filter matched to that finding is a reasonable precaution.
MOUNTAIN HOME, CITY OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 522 UCMR5 PFAS results for MOUNTAIN HOME, CITY OF (2023-11-28 to 2025-10-17) were at or above the reporting limit of roughly 3–5 ppt.
MOUNTAIN HOME, CITY OF has 152 violations on file since 2016: 2 health-based in the last five years and 146 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
MOUNTAIN HOME, CITY OF reports groundwater as its primary source and serves about 14,651 people (EPA PWSID ID4200032).
We recommend one. Check which contaminant the violations involved (table above) and choose a filter certified for it.
MOUNTAIN HOME, CITY OF has 2 health-based EPA violations in the last five years.
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Find the right filter for your Mountain Home water quality needs:
Tap water is one piece of the picture — our sister sites cover the rest for Mountain Home, ID.
County radon prediction and EPA zone for homes around Mountain Home.
Arsenic and nitrate risk for homes on a well instead of city water.
Understand your water better with our in-depth guides on contaminants, filtration, and water safety.