Penobscot County, Maine
45 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Penobscot County: 45 ZIP codes, mid-range safety grade.
How Penobscot County Compares
How Penobscot County Compares
Penobscot County scores 1 points below the Maine state average (57/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Penobscot County, Maine
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.3 (asthma 13.3%, diabetes 11.7%)
Estimated additional annual cost per homeowner: $1,040, driven primarily by sea_level
Infrastructure: 0.373% avg pipe failure probability, 27% of ZIPs at high risk
59.7% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Penobscot County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 9 total (9 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,040
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
66,001 housing units in Penobscot County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Penobscot County
Remediation costs are relatively manageable for most homeowners in Penobscot County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Penobscot County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Penobscot County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bangor Water District | 27,298 | 58 |
| 2 | Streamside Pines Mobile Home Park | 183 | 58 |
| 3 | Sun Hancock Heights- East | 158 | 58 |
| 4 | Sun Hancock Heights-west | 155 | 58 |
| 5 | Narraguagus Estates | 97 | 58 |
46 total water systems serve Penobscot County.
All ZIP Codes in Penobscot County
45 ZIP codes tracked in Penobscot County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 4430 | East Millinocket | 70 | B | 0 | $74K |
| 2 | 4444 | Hampden | 70 | B | 1 | $271K |
| 3 | 4448 | Howland | 70 | B | 1 | $116K |
| 4 | 4457 | Lincoln | 70 | B | 0 | $126K |
| 5 | 4462 | Millinocket | 70 | B | 0 | $90K |
| 6 | 4418 | Greenbush | 69 | C | 3 | $120K |
| 7 | 4459 | Mattawamkeag | 69 | C | 2 (1 health) | $84K |
| 8 | 4450 | Kenduskeag | 67 | C | 3 | $155K |
| 9 | 4435 | Exeter | 66 | C | 0 | $155K |
| 10 | 4453 | Lagrange | 66 | C | 1 | $129K |
| 11 | 4488 | Stetson | 66 | C | 0 | $186K |
| 12 | 4765 | Patten | 66 | C | 0 | $120K |
| 13 | 4928 | Corinna | 66 | C | 2 | $165K |
| 14 | 4417 | Burlington | 65 | C | 3 (1 health) | $93K |
| 15 | 4456 | Levant | 65 | C | 2 | $245K |
| 16 | 4474 | Orrington | 65 | C | 2 | $239K |
| 17 | 4953 | Newport | 65 | C | 6 (1 health) | $213K |
| 18 | 4969 | Plymouth | 64 | C | 2 | $188K |
| 19 | 4427 | Corinth | 60 | C | 7 | $124K |
| 20 | 4468 | Old Town | 60 | C | 5 | $182K |
| 21 | 4402 | Bangor | 57 | C | 29 (7 health) | — |
| 22 | 4422 | Charleston | 55 | C | 11 | $223K |
| 23 | 4428 | Eddington | 53 | D | 0 | $214K |
| 24 | 4449 | Hudson | 53 | D | 0 | $146K |
| 25 | 4487 | Springfield | 53 | D | 0 | $87K |
| 26 | 4489 | Stillwater | 53 | D | 0 | $229K |
| 27 | 4493 | West Enfield | 53 | D | 0 | $161K |
| 28 | 4495 | Winn | 53 | D | 0 | $96K |
| 29 | 4776 | Sherman | 53 | D | 0 | $101K |
| 30 | 4777 | Stacyville | 53 | D | 0 | $90K |
| 31 | 4401 | Bangor | 52 | D | 29 (7 health) | $230K |
| 32 | 4419 | Carmel | 51 | D | 15 | $235K |
| 33 | 4473 | Orono | 51 | D | 4 | $218K |
| 34 | 4469 | Orono | 48 | D | 4 | — |
| 35 | 4460 | Medway | 45 | D | 0 | $85K |
| 36 | 4475 | Passadumkeag | 45 | D | 0 | $93K |
| 37 | 4408 | Aurora | 40 | D | 0 | $202K |
| 38 | 4410 | Bradford | 40 | D | 0 | $179K |
| 39 | 4434 | Etna | 40 | D | 0 | $145K |
| 40 | 4451 | Kingman | 40 | D | 0 | $62K |
| 41 | 4733 | Benedicta | 40 | D | 0 | $127K |
| 42 | 4923 | Cambridge | 40 | D | 0 | $202K |
| 43 | 4932 | Dixmont | 40 | D | 0 | $178K |
| 44 | 4933 | East Newport | 40 | D | 0 | — |
| 45 | 4939 | Garland | 40 | D | 0 | $146K |
Recommended Buyer Guides for Penobscot County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 59.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Penobscot County, Maine
Overview
Penobscot County in Maine covers 45 ZIP codes with an average Home Safety Score of C (56/100).
20 of 45 ZIP codes have recorded EPA violations. 17 health-based violations have been documented.
← Back to Maine water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.