Is Green Rock, IL Tap Water Safe to Drink?
Graded A, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
93.4/100
waterverge.com Green Rock, IL — Water Quality Report
Green Rock's drinking water received a grade of A (93.4 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 2,640 residents using groundwater.
Lead levels were measured at 1.6 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 25 violations on record, including 0 health-based violations. 3 remain unresolved.
What to know about Green Rock's water
Green Rock ranks #40 out of 891 cities in Illinois for water quality, placing it one of the best in the state.
Green Rock 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, Green Rock may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Green Rock, IL water safe to drink?
Green Rock's drinking water has significant quality concerns based on EPA testing data. With a grade of A (93.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,640 residents using groundwater (wells).
Recent water quality updates for Green Rock
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Green Rock's water quality assessment. Grade: A (93.4/100).
Federal disaster declaration (FEMA DR-4461). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4116). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Green Rock's water supply.
Well within EPA limits.
Violation history
Green Rock's water system has 25 total violations on record, including 0 health-based violations. 3 remain unresolved.
Flood & environmental risk
Rock Island County has experienced 10 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. Local water sources include Miss R, Crow Creek At Bettendorf, Mill Creek.
Where does Green Rock's water come from?
Green Rock's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,640 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Miss R (river), Crow Creek At Bettendorf (river), Mill Creek (river).
What Green Rock residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Green Rock'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.
Green Rock'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
Rock Island County has experienced 10 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. | 1.6 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Green Rock compares by contaminant
Explore where Green Rock ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Green Rock's water comes from
Green Rock'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 2,640 people through 1 water system.
Water bodies near Green Rock
Green Rock is located near 3 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Green Rock
| System Name | PWSID | Population | Source |
|---|---|---|---|
| COLONA WEST | IL0730550 | 2,640 | GW |
How Green Rock compares
Full Illinois rankings →Green Rock's score of 93.4/100 is above the average of 56/100 among major Illinois cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Green Rock, IL
Wikipedia →Moline is a city in Rock Island County, Illinois, United States. With a population of 42,985 in the 2020 census, it is the largest city in Rock Island County and the ninth-most populous in Illinois outside the Chicago metropolitan area. Moline is one of the Quad Cities at the confluence of the Rock and Mississippi rivers, along with neighboring East Moline and Rock Island in Illinois and the cities of Davenport and Bettendorf in Iowa. The Quad Cities metropolitan area had a population of approximately 380,000 as of 2023.
Learn more about your water
Guides and resources related to Green Rock's water quality findings.
Explore water quality across Henry
Frequently asked questions
Is Green Rock, IL tap water safe to drink?
Green Rock's water quality earned a grade of A (93.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #40 out of 891 cities tested in Illinois.
What contaminants are in Green Rock's water?
Lead was measured at 1.6 ppb (90th percentile). 25 violations are on record.
How is Green Rock'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 Green Rock?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Green Rock's water come from?
Green Rock's water is sourced from Groundwater. The city has 1 water system serving approximately 2,640 residents.
Is Green Rock's groundwater at risk of contamination?
Green Rock 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 25 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 Green Rock's water compare to other cities?
Green Rock ranks #40 out of 891 cities in Illinois (better than 96% of state cities) and #847 out of 15744 cities nationally (95th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Green Rock's small water system affect quality?
Green Rock's system serves approximately 2,640 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 25 violations on record.