Is Long Grove, IL Tap Water Safe to Drink?
Graded C-, with 30 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
57.8/100
waterverge.com Long Grove, IL — Water Quality Report
Long Grove's drinking water received a grade of C- (57.8 out of 100), indicating poor water quality. The city's 10 water systems serve approximately 1,728 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 159 violations on record, including 51 health-based violations. 30 remain unresolved.
What to know about Long Grove's water
Long Grove ranks #818 out of 891 cities in Illinois for water quality, placing it among the lowest-rated in the state.
Long Grove 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, Long Grove may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 16 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Long Grove, IL water safe to drink?
Long Grove's drinking water has significant quality concerns based on EPA testing data. With a grade of C- (57.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 10 water systems serve approximately 1,728 residents using groundwater (wells).
Recent water quality updates for Long Grove
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Long Grove's water quality assessment. Grade: C- (57.8/100).
Contaminants: Public Notice, LEAD AND COPPER RULE REVISIONS, Consumer Confidence Rule.
Contaminants: Combined Radium (-226 and -228).
Contaminants: LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-4819). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4749). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Long Grove's water supply.
Well within EPA limits.
Violation history
Long Grove's water system has 159 total violations on record, including 51 health-based violations. 30 remain unresolved. 16 violations were issued in the last 5 years.
Flood & environmental risk
Cook County has experienced 9 federally declared disasters since 1972. 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 Buffalo Creek, Salt Creek, West Branch Du Page River.
Where does Long Grove's water come from?
Long Grove's drinking water comes from groundwater (wells), supplied by 10 water systems serving approximately 1,728 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Buffalo Creek (river), Salt Creek (river), West Branch Du Page River (river).
What Long Grove residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Long Grove'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.
Long Grove'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 Long Grove
Industrial polluters nearby
Reported releases to surface water by facilities near Long Grove, ranked by pounds discharged annually.
Total reported releases to surface water: 1 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
ACME ALLIANCE LLC NORTHBROOK, IL60062 | Copper | 1 | 8.0 mi |
NORTHFIELD BLOCK CO MUNDELEIN, IL60060 | Lead | 0 | 3.6 mi |
NATIONAL TECHNOLOGY INC ROLLING MEADOWS, IL60008 | — | — | 6.7 mi |
JESSUP MANUFACTURING CO LAKE BLUFF, IL60044 | — | — | 9.1 mi |
INDUSTRIAL WIRE & CABLE II CORP LAKE ZURICH, IL60047 | — | — | 3.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Long Grove
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- WAUCONDA SAND GRAVEL8.8 mi
Source: EPA Superfund National Priorities List
Flood & disaster history
Cook County has experienced 9 federally declared disasters since 1972. 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 Long Grove compares by contaminant
Explore where Long Grove ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Long Grove's water comes from
Long Grove'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 private ownership and serves approximately 1,728 people through 10 water systems.
Water bodies near Long Grove
Long Grove is located near 3 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Long Grove
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ROYAL MELBOURNE HOMEOWNERS ASN | IL0970170 | 382 | GW |
| FIELDS OF LONG GROVE | IL0971050 | 267 | GW |
| ALDEN LONG GROVE NURSING CENTER | IL0971090 | 211 | GW |
| THE PRESERVE AT LONG GROVE | IL0970310 | 204 | GW |
| AVANTARA LONG GROVE | IL0971110 | 200 | GW |
| PRAIRIE TRAILS OF LONG GROVE | IL0971200 | 189 | GW |
| PROMONTORY POINTE HOMEOWNERS ASSOCIATION | IL0970320 | 78 | GW |
| LONG GROVE | IL0970340 | 70 | GW |
| GLENSTONE SBDV HOA | IL0970160 | 65 | GW |
| NEW PERSPECTIVE SENIOR LIVING | IL0970330 | 62 | GW |
How Long Grove compares
Full Illinois rankings →Long Grove's score of 57.8/100 is on par with the average of 56/100 among major Illinois cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Long Grove, IL
Wikipedia →Schaumburg is a village in Cook and DuPage counties in the U.S. state of Illinois. At the 2020 census, the population was 78,723, making Schaumburg the most populous incorporated village in the United States. Schaumburg is around 26 miles (42 km) northwest of downtown Chicago and 10 miles (16 km) northwest of O'Hare International Airport. It is part of the Golden Corridor.
Learn more about your water
Guides and resources related to Long Grove's water quality findings.
Explore water quality across Lake
Frequently asked questions
Is Long Grove, IL tap water safe to drink?
Long Grove's water quality earned a grade of C- (57.8/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #818 out of 891 cities tested in Illinois.
What contaminants are in Long Grove's water?
Lead was measured at 0.0 ppb (90th percentile). 159 violations are on record.
How is Long Grove'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 Long Grove?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Long Grove's water come from?
Long Grove's water is sourced from Groundwater. The city has 10 water systems serving approximately 1,728 residents.
What health violations has Long Grove's water system had?
Long Grove has 51 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 30 violations remain unresolved.
Is Long Grove's groundwater at risk of contamination?
Long Grove 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 159 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 Long Grove's water compare to other cities?
Long Grove ranks #818 out of 891 cities in Illinois (better than 8% of state cities) and #12345 out of 15744 cities nationally (22th percentile). The grade of C- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.