Kennebec County, Maine
41 ZIP codes · Avg score 54/100 · Grade D · Updated 2026-07-19
ZipCheckup grade for Kennebec: D.
Several federal signals point to home-safety risks in this ZIP.
Kennebec County's 41 ZIP codes show a poor compliance record - repeated MCL exceedances have kept the county in the bottom tier for water safety.
How Kennebec County Compares
How Kennebec County Compares
Kennebec County scores 3 points below the Maine state average (57/100) and 14 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Kennebec County, Maine
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.3 (asthma 12.4%, diabetes 11.5%)
Estimated additional annual cost per homeowner: $940, driven primarily by flood
Infrastructure: 0.437% avg pipe failure probability, 64% of ZIPs at high risk
65.7% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Kennebec County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 14 violations. Past 5 years: 37 total (37 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.
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: $940
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
82,841 housing units in Kennebec 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 Kennebec County
Remediation costs are relatively manageable for most homeowners in Kennebec 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 Kennebec County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Kennebec County
8 community water systems serving Kennebec County.
- D
- C
- C
- D
- D
- B
Show all 8 water systems
- C
- C
35 total water systems serve Kennebec County.
Systems with the most violations in Kennebec County
5 water systems with recorded EPA violations.
- C
- C
- C
- D
- D
All ZIP Codes in Kennebec County
41 ZIP codes tracked in Kennebec County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 04259 | Monmouth | 70 | B | 0 | $282K |
| 2 | 04351 | Manchester | 70 | B | 0 | $285K |
| 3 | 04963 | Oakland | 70 | B | 1 | $228K |
| 4 | 04344 | Farmingdale | 69 | C | 2 | $206K |
| 5 | 04355 | Readfield | 69 | C | 2 | $301K |
| 6 | 04364 | Winthrop | 69 | C | 1 (1 health) | $273K |
| 7 | 04927 | Clinton | 69 | C | 2 | $172K |
| 8 | 04332 | Augusta | 67 | C | 6 | — |
| 9 | 04363 | Windsor | 66 | C | 0 | $216K |
| 10 | 04352 | Mount Vernon | 65 | C | 3 | $228K |
| 11 | 04333 | Augusta | 63 | C | 6 | — |
| 12 | 04336 | Augusta | 63 | C | 6 | — |
| 13 | 04338 | Augusta | 63 | C | 6 | — |
| 14 | 04350 | Litchfield | 63 | C | 12 (4 health) | $236K |
| 15 | 04989 | Vassalboro | 62 | C | 5 | $218K |
| 16 | 04347 | Hallowell | 60 | C | 0 | $267K |
| 17 | 04330 | Augusta | 57 | C | 6 | $198K |
| 18 | 04345 | Gardiner | 56 | C | 6 | $209K |
| 19 | 04341 | Coopers Mills | 53 | D | 0 | — |
| 20 | 04348 | Jefferson | 53 | D | 0 | $230K |
| 21 | 04358 | South China | 53 | D | 0 | $234K |
| 22 | 04359 | South Gardiner | 53 | D | 0 | $199K |
| 23 | 04910 | Albion | 53 | D | 0 | $208K |
| 24 | 04917 | Belgrade | 53 | D | 0 | $305K |
| 25 | 04918 | Belgrade Lakes | 53 | D | 0 | — |
| 26 | 04105 | Falmouth | 45 | D | 0 | $670K |
| 27 | 04106 | South Portland | 45 | D | 0 | $404K |
| 28 | 04108 | Peaks Island | 45 | D | 0 | $488K |
| 29 | 04019 | Cliff Island | 40 | D | 0 | $839K |
| 30 | 04050 | Long Island | 40 | D | 0 | $462K |
| 31 | 04116 | South Portland | 40 | D | 0 | — |
| 32 | 04265 | North Monmouth | 40 | D | 0 | $164K |
| 33 | 04343 | East Winthrop | 40 | D | 0 | — |
| 34 | 04353 | Whitefield | 40 | D | 0 | $220K |
| 35 | 04360 | Vienna | 40 | D | 0 | $249K |
| 36 | 04929 | Detroit | 40 | D | 0 | $135K |
| 37 | 04935 | East Vassalboro | 40 | D | 0 | — |
| 38 | 04962 | North Vassalboro | 40 | D | 0 | — |
| 39 | 04975 | Shawmut | 40 | D | 0 | $159K |
| 40 | 04903 | Waterville | 39 | F | 23 (10 health) | — |
| 41 | 04901 | Waterville | 38 | F | 23 (10 health) | $189K |
Recommended Buyer Guides for Kennebec County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 65.7% 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
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Kennebec County, Maine
Overview
Kennebec County in Maine covers 41 ZIP codes with an average Home Safety Score of D (54/100).
16 of 41 ZIP codes have recorded EPA violations. 25 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.
What You Can Do
Kennebec County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
65.7% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.