01The verdict: is Lewisboro (T) water safe?
Lewisboro (T)'s drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (83.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 630 residents using groundwater (wells).
7 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 ↓Lead is well under the limit
90th-percentile lead is 4.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓2 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Lewisboro (T)'s drinking water received a grade of B+ (83.6 out of 100), indicating good water quality. The city's 2 water systems serve approximately 630 residents using ground water under influence.
Lead levels were measured at 4.0 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 104 violations on record, including 3 health-based violations. 7 remain unresolved.
Lewisboro (T) ranks #20 out of 129 cities in Connecticut for water quality, placing it above average in the state. Lewisboro (T) 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, Lewisboro (T) may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Lewisboro (T)'s water
Every contaminant flagged in Lewisboro (T), 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.
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. | 4.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Connecticut
Cities ranked by compounds detected Cu Copper in Connecticut
Cities ranked by 90th-percentile copper
03Lewisboro (T)'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 104 violations on record, including 3 health-based violations. 7 remain unresolved.
7 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.
▲ Up 2.9 ppb since 1993. Latest reading: 4 ppb (2026) — 27% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Lewisboro (T)'s water comes from
Lewisboro (T)'s drinking water is drawn from underground aquifers through wells.
Ground Water Under Influence
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.
630 people
Residents served across Lewisboro (T)'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 630 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| MEADOWS AT CROSS RIVER | NY5920685 | 630 | Ground Water Under Influence |
| WACCABUC FARMS INC. | NY5903769 | 26 | Groundwater |
Water bodies near Lewisboro (T)
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05How Lewisboro (T) compares
Scores for nearby Connecticut cities on one line, with the average marked.
dashed line = Connecticut average (72/100)
Lewisboro (T) scores 83.6/100 — above the Connecticut average of 72/100. It outscores 5 of 10 nearby cities. Full Connecticut rankings →
82.4 / 100CBethany, CT
55.8 / 100ABranford, CT
85.4 / 100FCheshire, CT
35.5 / 100BDerby, CT
80.2 / 100AEast Haven, CT
85.4 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
06What to do at home
Steps matched to what testing actually found in Lewisboro (T)'s water — not generic advice.
A basic carbon filter still helps
Lewisboro (T)'s water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
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 Lewisboro (T) alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Lewisboro (T), CT tap water safe to drink?
Lewisboro (T)'s water quality earned a grade of B+ (83.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #20 out of 129 cities tested in Connecticut.
What contaminants are in Lewisboro (T)'s water?
Lead was measured at 4.0 ppb (90th percentile). 104 violations are on record.
How is Lewisboro (T)'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 Lewisboro (T)?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lewisboro (T)'s water come from?
Lewisboro (T)'s water is sourced from Ground water under influence. The city has 2 water systems serving approximately 630 residents.
What health violations has Lewisboro (T)'s water system had?
Lewisboro (T) has 3 health-based violations on record. The most recent violation was recorded in April 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 7 violations remain unresolved.
Is Lewisboro (T)'s groundwater at risk of contamination?
Lewisboro (T) 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 104 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 Lewisboro (T)'s water compare to other cities?
Lewisboro (T) ranks #20 out of 129 cities in Connecticut (better than 84% of state cities) and #6305 out of 15382 cities nationally (59th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.