01The verdict: is Carlisle water safe?
Carlisle's drinking water has significant quality concerns based on EPA testing data. With a grade of B (79.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,059 residents using surface water (rivers, lakes, or reservoirs).
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 ↓A flood-prone service area
4 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓Carlisle's drinking water received a grade of B (79.1 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,059 residents using surface water.
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 82 violations on record, including 38 health-based violations. 7 remain unresolved.
Carlisle ranks #160 out of 246 cities in Kentucky for water quality, placing it below average in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. As a small community water system, Carlisle may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Carlisle's water
Every contaminant flagged in Carlisle, 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 Kentucky
Cities ranked by compounds detected Cu Copper in Kentucky
Cities ranked by 90th-percentile copper
03Carlisle'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 82 violations on record, including 38 health-based violations. 7 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 1992. Latest reading: 4 ppb (2025) — 27% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Carlisle's water comes from
Carlisle's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under local government ownership.
2,059 people
Residents served across Carlisle's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by local government ownership and serves approximately 2,059 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| CARLISLE WATER DEPARTMENT | KY0910065 | 2,059 | Surface Water |
Water bodies near Carlisle
As a surface-water system, these water bodies may directly influence Carlisle's drinking water supply.
05Pressure on Carlisle'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.
Flood & storm history
4 federal disaster declarations on record for Nicholas County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Carlisle compares
Scores for nearby Kentucky cities on one line, with the average marked.
dashed line = Kentucky average (80/100)
Carlisle scores 79.1/100 — on par with the Kentucky average of 80/100. It outscores 5 of 10 nearby cities. Full Kentucky rankings →
82.2 / 100BLexington, KY
79 / 100AFt. Thomas, KY
86.8 / 100BBowling Green, KY
75.5 / 100AOwensboro, KY
85.1 / 100BElizabethtown, KY
81.2 / 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 Carlisle's water — not generic advice.
A basic carbon filter still helps
Carlisle'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 Carlisle 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 Carlisle, KY tap water safe to drink?
Carlisle's water quality earned a grade of B (79.1/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #160 out of 246 cities tested in Kentucky.
What contaminants are in Carlisle's water?
Lead was measured at 4.0 ppb (90th percentile). 82 violations are on record.
How is Carlisle'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 Carlisle?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Carlisle's water come from?
Carlisle's water is sourced from Surface water. The city has 1 water system serving approximately 2,059 residents.
What health violations has Carlisle's water system had?
Carlisle has 38 health-based violations on record. The most recent violation was recorded in September 2019. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 7 violations remain unresolved.
How does Carlisle's water compare to other cities?
Carlisle ranks #160 out of 246 cities in Kentucky (better than 35% of state cities) and #8286 out of 15382 cities nationally (46th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Carlisle's small water system affect quality?
Carlisle's system serves approximately 2,059 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 82 violations on record.