Is Iona, ID Tap Water Safe to Drink?
Graded A-, with 6 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.1/100
waterverge.com Iona, ID — Water Quality Report
Iona's drinking water received a grade of A- (87.1 out of 100), indicating good water quality. The city's 2 water systems serve approximately 2,892 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 72 violations on record, including 23 health-based violations. 6 remain unresolved.
What to know about Iona's water
Iona ranks #40 out of 139 cities in Idaho for water quality, placing it mid-range in the state.
Iona relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Iona may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Iona, ID water safe to drink?
Iona's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (87.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,892 residents using groundwater (wells).
Recent water quality updates for Iona
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Iona's water quality assessment. Grade: A- (87.1/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-3244). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-505). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Iona's water supply.
Well within EPA limits.
Violation history
Iona's water system has 72 total violations on record, including 23 health-based violations. 6 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Bonneville County has experienced 3 federally declared disasters since 1964. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Great Western Spillback Nr Idaho Falls, Snake River Ab Eagle Rock Nr Idaho Falls, Sand Creek, Willow Creek Floodway Channel Nr Ucon, Willow Cr Floodway Channel.
Where does Iona's water come from?
Iona's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 2,892 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Great Western Spillback Nr Idaho Falls (river), Snake River Ab Eagle Rock Nr Idaho Falls (river), Sand Creek (river), Willow Creek Floodway Channel Nr Ucon (river), Willow Cr Floodway Channel (river).
What Iona residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Iona's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Iona's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Iona
Industrial polluters nearby
Reported releases to surface water by facilities near Iona, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
INGREDION INC IDAHO FALLS PLANT IDAHO FALLS, ID83402 | — | — | 7.3 mi |
OLDCASTLE PRECAST INC IDAHO FALLS, ID83402 | — | — | 6.9 mi |
AMERICAN FABRICATION INC. IDAHO FALLS, ID83402 | — | — | 9.3 mi |
CRANNY PIT IDAHO FALLS, ID83402 | — | — | 7.9 mi |
CIVES STEEL IDAHO IDAHO FALLS, ID83401 | — | — | 4.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtBonneville County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Bonneville County has experienced 3 federally declared disasters since 1964. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Iona compares by contaminant
Explore where Iona ranks among all Idaho cities for specific contaminants.
Water source & infrastructure
Where Iona's water comes from
Iona's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 2,892 people through 2 water systems.
Water bodies near Iona
Iona is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Iona
| System Name | PWSID | Population | Source |
|---|---|---|---|
| IONA WATER DEPT | ID7100041 | 2,717 | GW |
| PANORAMA HILLS WATER COMPANY | ID7100067 | 175 | GW |
How Iona compares
Full Idaho rankings →Iona's score of 87.1/100 is above the average of 43/100 among major Idaho cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Idaho rankings →About Iona, ID
Learn more about your water
Guides and resources related to Iona's water quality findings.
Explore water quality across Bonneville
Frequently asked questions
Is Iona, ID tap water safe to drink?
Iona's water quality earned a grade of A- (87.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #40 out of 139 cities tested in Idaho.
What contaminants are in Iona's water?
Lead was measured at 0.0 ppb (90th percentile). 72 violations are on record.
How is Iona's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Iona?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Iona's water come from?
Iona's water is sourced from Groundwater. The city has 2 water systems serving approximately 2,892 residents.
What health violations has Iona's water system had?
Iona has 23 health-based violations on record. The most recent violation was recorded in May 2021. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 6 violations remain unresolved.
Is Iona's groundwater at risk of contamination?
Iona uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 72 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Iona's water compare to other cities?
Iona ranks #40 out of 139 cities in Idaho (better than 71% of state cities) and #4244 out of 15744 cities nationally (73th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.