01The verdict: is Lewis Run water safe?
Lewis Run's drinking water has significant quality concerns based on EPA testing data. With a grade of B (77.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 892 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 5.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓6 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 ↓Lewis Run's drinking water received a grade of B (77.1 out of 100), indicating good water quality. The city's 1 water system serves approximately 892 residents using purchased surface water.
Lead levels were measured at 5.0 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 148 violations on record, including 1 health-based violation. 7 remain unresolved.
Lewis Run ranks #120 out of 559 cities in Pennsylvania for water quality, placing it above 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, Lewis Run may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 6 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Lewis Run's water
Every contaminant flagged in Lewis Run, 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. | 5.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Pennsylvania
Cities ranked by compounds detected Cu Copper in Pennsylvania
Cities ranked by 90th-percentile copper
03Lewis Run'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 148 violations on record, including 1 health-based violation. 7 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 14 ppb since 1993. Latest reading: 5 ppb (1994) — 33% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Lewis Run's water comes from
Lewis Run'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.
1 system
1 water system, operated under local government ownership.
892 people
Residents served across Lewis Run'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 892 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| LEWIS RUN BOROUGH | PA6420020 | 892 | Purchased Surface Water |
Water bodies near Lewis Run
As a surface-water system, these water bodies may directly influence Lewis Run's drinking water supply.
05Pressure on Lewis Run'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 442 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
6 federal disaster declarations on record for McKean County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Lewis Run compares
Scores for nearby Pennsylvania cities on one line, with the average marked.
dashed line = Pennsylvania average (49/100)
Lewis Run scores 77.1/100 — above the Pennsylvania average of 49/100. It outscores 8 of 10 nearby cities. Full Pennsylvania rankings →
79.8 / 100FBryn Mawr, PA
34.2 / 100FPittsburgh, PA
44 / 100AMcmurray, PA
86.8 / 100DGreensburg, PA
46.7 / 100FHarrisburg, PA
35.6 / 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 Lewis Run's water — not generic advice.
A basic carbon filter still helps
Lewis Run'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 Lewis Run 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 Lewis Run, PA tap water safe to drink?
Lewis Run's water quality earned a grade of B (77.1/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #120 out of 559 cities tested in Pennsylvania.
What contaminants are in Lewis Run's water?
Lead was measured at 5.0 ppb (90th percentile). 148 violations are on record.
How is Lewis Run'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 Lewis Run?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lewis Run's water come from?
Lewis Run's water is sourced from Purchased surface water. The city has 1 water system serving approximately 892 residents.
What health violations has Lewis Run's water system had?
Lewis Run has 1 health-based violation 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. 7 violations remain unresolved.
How does Lewis Run's water compare to other cities?
Lewis Run ranks #120 out of 559 cities in Pennsylvania (better than 79% of state cities) and #9007 out of 15382 cities nationally (41th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Lewis Run's small water system affect quality?
Lewis Run's system serves approximately 892 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 148 violations on record.