01The verdict: is Lake Barrington water safe?
Lake Barrington's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (71.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,800 residents using groundwater (wells).
8 unresolved violations on record
EPA records show open compliance items for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓3K people, 2 systems
All figures on this page come from federal EPA compliance and testing data for the systems serving this city.
See the systems ↓Lead is approaching its limit
Measured at 15.0 ppb — 100% of the 15 ppb limit. Within the rules, but with less headroom than you'd want.
See the ledger ↓Lake Barrington's drinking water received a grade of B- (71.1 out of 100), indicating fair water quality. The city's 2 water systems serve approximately 2,800 residents using groundwater.
Lead levels were measured at 15.0 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 67 violations on record, including 5 health-based violations. 8 remain unresolved.
Lake Barrington ranks #724 out of 882 cities in Illinois for water quality, placing it among the lowest-rated in the state. Lake Barrington 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. While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection. As a small community water system, Lake Barrington may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Lake Barrington's water
Every contaminant flagged in Lake Barrington, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Near Limit — EPA Action Level: 15 ppb
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb — no lead level is considered safe for children. An NSF 53-certified filter provides additional protection, and running the cold tap 30 seconds after stagnation reduces exposure.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. | 15.0 | 15 | ppb | Inorganic | Near Limit |
Cities ranked by 90th-percentile lead PF PFAS in Illinois
Cities ranked by compounds detected Cu Copper in Illinois
Cities ranked by 90th-percentile copper
03Lake Barrington's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 67 violations on record, including 5 health-based violations. 8 remain unresolved.
8 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 6 ppb since 1993. The latest reading (15 ppb, 2025) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Lake Barrington's water comes from
Lake Barrington's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
2 systems
2 water systems, operated under private ownership.
2,800 people
Residents served across Lake Barrington's service area.
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 2,800 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| LAKE BARRINGTON SHORES SUBDIVSION | IL0975520 | 2,300 | Groundwater |
| LAKE BARRINGTON | IL0971080 | 500 | Groundwater |
Water bodies near Lake Barrington
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Lake Barrington's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
5 facilities within 10 miles reported 0 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
5 federal disaster declarations on record for Lake County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
Superfund proximity
1 National Priorities List site within 10 miles. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
06How Lake Barrington compares
Scores for nearby Illinois cities on one line, with the average marked.
dashed line = Illinois average (55/100)
Lake Barrington scores 71.1/100 — above the Illinois average of 55/100. It outscores 7 of 10 nearby cities. Full Illinois rankings →
35.2 / 100DAurora, IL
45.5 / 100FJoliet, IL
38.5 / 100BNaperville, IL
81.2 / 100FRockford, IL
38.4 / 100FKankakee, IL
42.6 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Lake Barrington's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Lead detected at 15.0 ppb
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Lake Barrington alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Lake Barrington, IL tap water safe to drink?
Lake Barrington's water quality earned a grade of B- (71.1/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #724 out of 882 cities tested in Illinois.
What contaminants are in Lake Barrington's water?
Lead was measured at 15.0 ppb (90th percentile). 67 violations are on record.
How is Lake Barrington'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 Lake Barrington?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lake Barrington's water come from?
Lake Barrington's water is sourced from Groundwater. The city has 2 water systems serving approximately 2,800 residents.
What health violations has Lake Barrington's water system had?
Lake Barrington has 5 health-based violations on record. The most recent violation was recorded in August 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
Is Lake Barrington's groundwater at risk of contamination?
Lake Barrington 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 67 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 Lake Barrington's water compare to other cities?
Lake Barrington ranks #724 out of 882 cities in Illinois (better than 18% of state cities) and #10471 out of 15382 cities nationally (32th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.