Is Sibley, IA Tap Water Safe to Drink?
Graded A- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
87.6/100
waterverge.com Sibley, IA — Water Quality Report
Sibley's drinking water received a grade of A- (87.6 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,860 residents using purchased ground water.
Lead levels were measured at 1.0 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 4 violations on record, including 0 health-based violations. 1 remains unresolved.
What to know about Sibley's water
Sibley ranks #283 out of 436 cities in Iowa for water quality, placing it below average in the state.
Sibley 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, Sibley may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Sibley, IA water safe to drink?
Sibley's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (87.6/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,860 residents using groundwater (wells).
Recent water quality updates for Sibley
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Sibley's water quality assessment. Grade: A- (87.6/100).
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4184). Flood event — may have impacted local water infrastructure.
Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
Contaminants: Nitrate.
Key contaminant findings
Based on the most recent EPA sampling data for Sibley's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Sibley's water system has 4 total violations on record, including 0 health-based violations. 1 remain unresolved.
Flood & environmental risk
Osceola County has experienced 7 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.
Where does Sibley's water come from?
Sibley's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,860 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Sibley 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.
Sibley'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 Sibley
Industrial polluters nearby
Reported releases to surface water by facilities near Sibley, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
POET BIOREFINING - ASHTON ASHTON, IA51232 | — | — | 9.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Osceola County has experienced 7 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Sibley's water supply, we recommend the following filter types.
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. | 1.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.40 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 1.400 mg/L (2002)
EPA action level: 1.3 mg/L
See how Sibley compares by contaminant
Explore where Sibley ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Sibley's water comes from
Sibley 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 Sibley'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 2,860 people through 1 water system.
Water systems serving Sibley
| System Name | PWSID | Population | Source |
|---|---|---|---|
| SIBLEY PUBLIC WATER SUPPLY | IA7245047 | 2,860 | GWP |
How Sibley compares
Full Iowa rankings →Sibley's score of 87.6/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Sibley, IA
Learn more about your water
Guides and resources related to Sibley's water quality findings.
Explore water quality across Osceola
Frequently asked questions
Is Sibley, IA tap water safe to drink?
Sibley's water quality earned a grade of A- (87.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #283 out of 436 cities tested in Iowa.
What contaminants are in Sibley's water?
Lead was measured at 1.0 ppb (90th percentile). 4 violations are on record.
How is Sibley'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 Sibley?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Sibley's water come from?
Sibley's water is sourced from Purchased ground water. The city has 1 water system serving approximately 2,860 residents.
Is Sibley's groundwater at risk of contamination?
Sibley 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 4 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 Sibley's water compare to other cities?
Sibley ranks #283 out of 436 cities in Iowa (better than 35% of state cities) and #3943 out of 15744 cities nationally (75th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Sibley's small water system affect quality?
Sibley's system serves approximately 2,860 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 4 violations on record.