01The verdict: is North Warren water safe?
North Warren's tap water meets most EPA standards but has areas that warrant attention. With a grade of B- (72.6/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 721 residents using groundwater (wells).
Lead is over its legal limit
Measured at 23.7 ppb against the EPA Action Level of 15 ppb. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Monitoring is on schedule
The system is meeting its EPA monitoring and reporting requirements — testing is happening when it should.
See the score ↓16 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 ↓North Warren's drinking water received a grade of B- (72.6 out of 100), indicating fair water quality. The city's 1 water system serves approximately 721 residents using groundwater.
Lead levels were measured at 23.7 ppb (90th percentile), which exceeds the EPA action level of 15 ppb. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 58 violations on record, including 1 health-based violation. 2 remain unresolved.
North Warren ranks #167 out of 559 cities in Pennsylvania for water quality, placing it mid-range in the state. North Warren 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. Lead levels exceed the EPA action level of 15 ppb, which typically indicates aging lead service lines or lead solder in the distribution system. An NSF 53-certified filter is strongly recommended for drinking and cooking water. As a small community water system, North Warren may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 16 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in North Warren's water
Every contaminant flagged in North Warren, 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.
Over Limit — EPA Action Level: 15 ppb
Exceeds the EPA action level. Lead enters at the service line, not the treatment plant — your address matters more than the city average. Lead service line replacement and an NSF 53-certified point-of-use filter are recommended.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. | 23.7 | 15 | ppb | Inorganic | Over Limit |
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
03North Warren'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 58 violations on record, including 1 health-based violation. 2 remain unresolved.
5 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 17 ppb since 1996. The latest reading (24 ppb, 2022) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where North Warren's water comes from
North Warren'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.
1 system
1 water system, operated under state ownership.
721 people
Residents served across North Warren'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 state ownership and serves approximately 721 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| WARREN STATE HOSPITAL | PA6620034 | 721 | Groundwater |
Water bodies near North Warren
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on North Warren'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 3k 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 Warren County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How North Warren compares
Scores for nearby Pennsylvania cities on one line, with the average marked.
dashed line = Pennsylvania average (49/100)
North Warren scores 72.6/100 — 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 North Warren's water — not generic advice.
Filter drinking & cooking water
NSF 53-certified pitcher or under-sink filter. Lead level (23.7 ppb) exceeds the EPA action level of 15 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 North Warren 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 North Warren, PA tap water safe to drink?
North Warren's water quality earned a grade of B- (72.6/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #167 out of 559 cities tested in Pennsylvania.
What contaminants are in North Warren's water?
Lead was measured at 23.7 ppb (90th percentile). 58 violations are on record.
How is North Warren'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 North Warren?
Yes — lead levels exceed the EPA action level of 15 ppb. We recommend an NSF 53-certified filter or reverse osmosis system. Based on current data, basic filtration should suffice for additional peace of mind.
Where does North Warren's water come from?
North Warren's water is sourced from Groundwater. The city has 1 water system serving approximately 721 residents.
What health violations has North Warren's water system had?
North Warren has 1 health-based violation on record. The most recent violation was recorded in February 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is North Warren's groundwater at risk of contamination?
North Warren 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 58 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 North Warren's water compare to other cities?
North Warren ranks #167 out of 559 cities in Pennsylvania (better than 70% of state cities) and #10151 out of 15382 cities nationally (34th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does North Warren's small water system affect quality?
North Warren's system serves approximately 721 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 58 violations on record.