01The verdict: is Cadia water safe?
Cadia's drinking water has significant quality concerns based on EPA testing data. With a grade of B (78.2/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 868 residents using surface water (rivers, lakes, or reservoirs).
15 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 ↓868 people, 4 systems
All figures on this page come from federal EPA compliance and testing data for the systems serving this city.
See the systems ↓1 violation 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 ↓Cadia's drinking water received a grade of B (78.2 out of 100), indicating good water quality. The city's 4 water systems serve approximately 868 residents using purchased surface water.
Lead levels were measured at 5.1 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 109 violations on record, including 14 health-based violations. 15 remain unresolved.
Cadia ranks #309 out of 511 cities in Ohio 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. 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, Cadia may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Cadia's water
Every contaminant flagged in Cadia, 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. | 5.1 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Ohio
Cities ranked by compounds detected Cu Copper in Ohio
Cities ranked by 90th-percentile copper
03Cadia'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 109 violations on record, including 14 health-based violations. 15 remain unresolved.
6 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 5.4 ppb since 1993. Latest reading: 1.2 ppb (2025) — 8% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Cadia's water comes from
Cadia's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Purchased Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Wholesale supplier
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
4 systems
4 water systems, operated under private ownership.
868 people
Residents served across Cadia'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 private ownership and serves approximately 868 people through 4 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| HCWSD-UNIONVALE-KENWOOD | OH3401503 | 257 | Purchased Surface Water |
| HARRISON COUNTY W&S DIST-GEORGETOWN | OH3400503 | 242 | Purchased Groundwater |
| HCWSD - EAST CADIZ | OH3439717 | 191 | Purchased Surface Water |
| HCWSD-PIEDMONT PWS | OH3401212 | 178 | Groundwater |
05How Cadia compares
Scores for nearby Ohio cities on one line, with the average marked.
dashed line = Ohio average (58/100)
Cadia scores 78.2/100 — above the Ohio average of 58/100. It outscores 9 of 10 nearby cities. Full Ohio rankings →
35.5 / 100ACleveland, OH
85.5 / 100FCincinnati, OH
36.8 / 100BToledo, OH
78 / 100FKent, OH
38.2 / 100CKettering, OH
64.6 / 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 Cadia's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. Lead detected at 5.1 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 Cadia 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 Cadia, OH tap water safe to drink?
Cadia's water quality earned a grade of B (78.2/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #309 out of 511 cities tested in Ohio.
What contaminants are in Cadia's water?
Lead was measured at 5.1 ppb (90th percentile). 109 violations are on record.
How is Cadia'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 Cadia?
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 Cadia's water come from?
Cadia's water is sourced from Purchased surface water. The city has 4 water systems serving approximately 868 residents.
What health violations has Cadia's water system had?
Cadia has 14 health-based violations on record. The most recent violation was recorded in January 2021. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 15 violations remain unresolved.
How does Cadia's water compare to other cities?
Cadia ranks #309 out of 511 cities in Ohio (better than 40% of state cities) and #8671 out of 15382 cities nationally (44th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.