Is Gilman, IA Tap Water Safe to Drink?
Graded A+ with no contaminants above EPA limits. Here's everything we tested and how Gilman ranks. What to do next ↓
95.9/100
waterverge.com Gilman, IA — Water Quality Report
Gilman's drinking water received a grade of A+ (95.9 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 582 residents using purchased ground water.
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 8 violations on record, including 7 health-based violations. All violations have been resolved.
What to know about Gilman's water
Gilman ranks #4 out of 436 cities in Iowa for water quality, placing it one of the best in the state.
Gilman purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition.
As a small community water system, Gilman may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Gilman, IA water safe to drink?
Based on EPA testing data, Gilman's tap water is generally safe to drink. The water system earned a grade of A+ (95.9/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 582 residents using groundwater (wells).
Recent water quality updates for Gilman
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Gilman's water quality assessment. Grade: A+ (95.9/100).
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3239). Hurricane event — may have impacted local water infrastructure.
1 health-based. Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
2 health-based. Contaminants: Nitrate.
Key contaminant findings
Based on the most recent EPA sampling data for Gilman's water supply.
Well within EPA limits.
Violation history
Gilman's water system has 8 total violations on record, including 7 health-based violations. All violations have been resolved.
Flood & environmental risk
Jasper County has experienced 7 federally declared disasters since 1969. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Gilman's water come from?
Gilman's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 582 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Gilman residents can do
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.
Gilman'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
Flood & disaster history
Jasper County has experienced 7 federally declared disasters since 1969. 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 Gilman compares by contaminant
Explore where Gilman ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Gilman's water comes from
Gilman purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Water quality depends on both the wholesaler's treatment standards and the condition of Gilman's local distribution pipes and storage facilities.
Purchased water systems are common in suburban areas and smaller communities that lack the infrastructure for independent treatment.
The system is operated by local government ownership and serves approximately 582 people through 1 water system.
Water systems serving Gilman
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GILMAN WATER SUPPLY | IA6436087 | 582 | GWP |
How Gilman compares
Full Iowa rankings →Gilman's score of 95.9/100 is above the average of 72/100 among major Iowa cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Gilman, IA
Learn more about your water
Guides and resources related to Gilman's water quality findings.
Explore water quality across Marshall
Frequently asked questions
Is Gilman, IA tap water safe to drink?
Gilman's water quality earned a grade of A+ (95.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #4 out of 436 cities tested in Iowa.
What contaminants are in Gilman's water?
Lead was measured at 0.0 ppb (90th percentile). 8 violations are on record.
How is Gilman'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 Gilman?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Gilman's water come from?
Gilman's water is sourced from Purchased ground water. The city has 1 water system serving approximately 582 residents.
What health violations has Gilman's water system had?
Gilman has 7 health-based violations on record. The most recent violation was recorded in May 1999. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. All health violations have been resolved.
Is Gilman's groundwater at risk of contamination?
Gilman 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 8 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 Gilman's water compare to other cities?
Gilman ranks #4 out of 436 cities in Iowa (better than 99% of state cities) and #262 out of 15744 cities nationally (98th percentile). The grade of A+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Gilman's small water system affect quality?
Gilman's system serves approximately 582 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 8 violations on record.