Is Gridley, IL Tap Water Safe to Drink?
Graded B+ — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
83/100
waterverge.com Gridley, IL — Water Quality Report
Gridley's drinking water received a grade of B+ (83 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,411 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 7 violations on record, including 1 health-based violation. 3 remain unresolved.
What to know about Gridley's water
Gridley ranks #466 out of 891 cities in Illinois for water quality, placing it below average in the state.
Gridley 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, Gridley may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Gridley, IL water safe to drink?
Gridley's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (83/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,411 residents using groundwater (wells).
Recent water quality updates for Gridley
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Gridley's water quality assessment. Grade: B+ (83/100).
1 health-based. Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-373). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Gridley'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
Gridley's water system has 7 total violations on record, including 1 health-based violation. 3 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
McLean County has experienced 2 federally declared disasters since 1973. 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 Money Creek, Sixmile Creek.
Where does Gridley's water come from?
Gridley's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,411 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Money Creek (river), Sixmile Creek (river).
What Gridley residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Gridley'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.
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 Gridley
Industrial polluters nearby
Reported releases to surface water by facilities near Gridley, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CORTEVA AGRISCIENCE LLC - EL PASO PLANT EL PASO, IL61738 | — | — | 5.8 mi |
AMERICAN BUILDINGS CO EL PASO EL PASO, IL61738 | — | — | 6.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
McLean County has experienced 2 federally declared disasters since 1973. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Gridley'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. | 0.0 | 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 trend (90th percentile)
See how Gridley compares by contaminant
Explore where Gridley ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Gridley's water comes from
Gridley'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 1,411 people through 1 water system.
Water bodies near Gridley
Gridley is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Gridley
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GRIDLEY | IL1130600 | 1,411 | GW |
How Gridley compares
Full Illinois rankings →Gridley's score of 83/100 is above the average of 56/100 among major Illinois cities. It outscores 8 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Gridley, IL
Wikipedia →Gridley is a village in McLean County, Illinois, United States. The population was 1,456 at the 2020 census. It is part of the Bloomington–Normal Metropolitan Statistical Area.
Learn more about your water
Guides and resources related to Gridley's water quality findings.
Explore water quality across Mclean
Frequently asked questions
Is Gridley, IL tap water safe to drink?
Gridley's water quality earned a grade of B+ (83/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #466 out of 891 cities tested in Illinois.
What contaminants are in Gridley's water?
Lead was measured at 0.0 ppb (90th percentile). 7 violations are on record.
How is Gridley'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 Gridley?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Gridley's water come from?
Gridley's water is sourced from Groundwater. The city has 1 water system serving approximately 1,411 residents.
What health violations has Gridley's water system had?
Gridley has 1 health-based violation on record. The most recent violation was recorded in April 2021. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Gridley's groundwater at risk of contamination?
Gridley 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 7 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 Gridley's water compare to other cities?
Gridley ranks #466 out of 891 cities in Illinois (better than 48% of state cities) and #6662 out of 15744 cities nationally (58th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Gridley's small water system affect quality?
Gridley's system serves approximately 1,411 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 7 violations on record.