Is Charter Oak, IA Tap Water Safe to Drink?
Graded A, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
94.8/100
waterverge.com Charter Oak, IA — Water Quality Report
Charter Oak's drinking water received a grade of A (94.8 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 522 residents using purchased ground water.
Lead levels were measured at 3.0 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 24 violations on record, including 3 health-based violations. 1 remains unresolved.
What to know about Charter Oak's water
Charter Oak ranks #14 out of 436 cities in Iowa for water quality, placing it one of the best in the state.
Charter Oak 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, Charter Oak may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Charter Oak, IA water safe to drink?
Charter Oak's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (94.8/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 522 residents using groundwater (wells).
Recent water quality updates for Charter Oak
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Charter Oak's water quality assessment. Grade: A (94.8/100).
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Contaminants: Coliform (TCR).
Federal disaster declaration (FEMA DR-3239). Hurricane event — may have impacted local water infrastructure.
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Charter Oak's water supply.
Well within EPA limits.
Violation history
Charter Oak's water system has 24 total violations on record, including 3 health-based violations. 1 remain unresolved.
Flood & environmental risk
Crawford County has experienced 9 federally declared disasters since 1965. 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 Willow Creek Near Soldier.
Where does Charter Oak's water come from?
Charter Oak's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 522 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Willow Creek Near Soldier (river).
What Charter Oak 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.
Charter Oak'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
Crawford County has experienced 9 federally declared disasters since 1965. 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. | 3.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Charter Oak compares by contaminant
Explore where Charter Oak ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Charter Oak's water comes from
Charter Oak 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 Charter Oak'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 522 people through 1 water system.
Water bodies near Charter Oak
Charter Oak is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Charter Oak
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CHARTER OAK WATER SUPPLY | IA2417018 | 522 | GWP |
How Charter Oak compares
Full Iowa rankings →Charter Oak's score of 94.8/100 is above the average of 72/100 among major Iowa cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Charter Oak, IA
Wikipedia →Charter Oak is a city in Crawford County, Iowa, United States, along the East Soldier River. The population was 535 at the 2020 census.
Learn more about your water
Guides and resources related to Charter Oak's water quality findings.
Explore water quality across Crawford
Frequently asked questions
Is Charter Oak, IA tap water safe to drink?
Charter Oak's water quality earned a grade of A (94.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #14 out of 436 cities tested in Iowa.
What contaminants are in Charter Oak's water?
Lead was measured at 3.0 ppb (90th percentile). 24 violations are on record.
How is Charter Oak'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 Charter Oak?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Charter Oak's water come from?
Charter Oak's water is sourced from Purchased ground water. The city has 1 water system serving approximately 522 residents.
What health violations has Charter Oak's water system had?
Charter Oak has 3 health-based violations on record. The most recent violation was recorded in July 2019. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Charter Oak's groundwater at risk of contamination?
Charter Oak 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 24 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 Charter Oak's water compare to other cities?
Charter Oak ranks #14 out of 436 cities in Iowa (better than 97% of state cities) and #431 out of 15744 cities nationally (97th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Charter Oak's small water system affect quality?
Charter Oak's system serves approximately 522 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 24 violations on record.