Norfolk County, Massachusetts
55 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Water safety in Norfolk County is uneven — some of its 55 ZIP codes meet standards cleanly while others carry documented violations.
How Norfolk County Compares
How Norfolk County Compares
Norfolk County scores 0 points above the Massachusetts state average (66/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Norfolk County, Massachusetts
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.5 (asthma 11%, diabetes 9.2%)
Estimated additional annual cost per homeowner: $2,198, driven primarily by flood
Infrastructure: 0.448% avg pipe failure probability, 80% of ZIPs at high risk
75.1% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Norfolk County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 16 violations. Past 5 years: 36 total (36 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: $2,198
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
367,923 housing units in Norfolk 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 Norfolk County
Remediation costs are relatively manageable for most homeowners in Norfolk 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 Norfolk 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 Norfolk County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Mount St Marys Abbey | 60 | 21 |
| 2 | WRENTHAM WATER DIVISION | 11,795 | 21 |
| 3 | Wrentham Developmental Center | 937 | 21 |
| 4 | Holbrook Public Works Department | 11,405 | 9 |
| 5 | Randolph/holbrook Joint Water Board | 45,767 | 9 |
45 total water systems serve Norfolk County.
All ZIP Codes in Norfolk County
55 ZIP codes tracked in Norfolk County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 2053 | Medway | 83 | B | 1 | $589K |
| 2 | 2054 | Millis | 83 | B | 0 | $570K |
| 3 | 2322 | Avon | 83 | B | 0 | $483K |
| 4 | 2445 | Brookline | 83 | B | 0 | $1218K |
| 5 | 2027 | Dedham | 82 | B | 1 (1 health) | — |
| 6 | 2185 | Braintree | 81 | B | 2 | — |
| 7 | 2038 | Franklin | 78 | B | 0 | $567K |
| 8 | 2052 | Medfield | 78 | B | 1 | $869K |
| 9 | 2067 | Sharon | 78 | B | 0 | $698K |
| 10 | 2081 | Walpole | 78 | B | 0 | $647K |
| 11 | 2188 | Weymouth | 78 | B | 1 | $543K |
| 12 | 2446 | Brookline | 78 | B | 0 | $1173K |
| 13 | 2492 | Needham | 78 | B | 0 | $1177K |
| 14 | 2021 | Canton | 76 | B | 1 | $666K |
| 15 | 2072 | Stoughton | 76 | B | 1 | $497K |
| 16 | 2762 | Plainville | 75 | B | 2 (2 health) | $461K |
| 17 | 2019 | Bellingham | 74 | B | 6 (4 health) | $426K |
| 18 | 2056 | Norfolk | 74 | B | 6 | $694K |
| 19 | 2482 | Wellesley | 74 | B | 2 | $1255K |
| 20 | 2026 | Dedham | 72 | B | 1 (1 health) | $630K |
| 21 | 2184 | Braintree | 71 | B | 2 | $623K |
| 22 | 2269 | Quincy | 71 | B | 0 | — |
| 23 | 2368 | Randolph | 70 | B | 4 | $464K |
| 24 | 2025 | Cohasset | 69 | C | 3 | $1093K |
| 25 | 2030 | Dover | 68 | C | 5 | $1286K |
| 26 | 2343 | Holbrook | 68 | C | 5 | $435K |
| 27 | 2186 | Milton | 66 | C | 0 | $897K |
| 28 | 2062 | Norwood | 65 | C | 0 | $614K |
| 29 | 2170 | Quincy | 64 | C | 0 | $662K |
| 30 | 2032 | East Walpole | 63 | C | 0 | $673K |
| 31 | 2070 | Sheldonville | 63 | C | 0 | — |
| 32 | 2071 | South Walpole | 63 | C | 0 | $590K |
| 33 | 2134 | Allston | 63 | C | 0 | $587K |
| 34 | 2137 | Readville | 63 | C | 0 | — |
| 35 | 2464 | Newton Upper Falls | 63 | C | 0 | $899K |
| 36 | 2494 | Needham Heights | 63 | C | 0 | $1052K |
| 37 | 2763 | Attleboro Falls | 63 | C | 0 | $557K |
| 38 | 2171 | Quincy | 59 | C | 0 | $630K |
| 39 | 2093 | Wrentham | 58 | C | 21 (11 health) | $600K |
| 40 | 2055 | Minot | 55 | C | 0 | — |
| 41 | 2060 | North Scituate | 55 | C | 0 | — |
| 42 | 2090 | Westwood | 55 | C | 0 | $986K |
| 43 | 2124 | Dorchester Center | 55 | C | 0 | $607K |
| 44 | 2126 | Mattapan | 55 | C | 0 | $515K |
| 45 | 2131 | Roslindale | 55 | C | 0 | $634K |
| 46 | 2132 | West Roxbury | 55 | C | 0 | $714K |
| 47 | 2136 | Hyde Park | 55 | C | 0 | $566K |
| 48 | 2190 | South Weymouth | 55 | C | 0 | $555K |
| 49 | 2467 | Chestnut Hill | 55 | C | 0 | $1249K |
| 50 | 2169 | Quincy | 54 | D | 0 | $552K |
| 51 | 2187 | Milton Village | 53 | D | 0 | — |
| 52 | 2457 | Babson Park | 53 | D | 0 | — |
| 53 | 2761 | North Attleboro | 53 | D | 0 | — |
| 54 | 2760 | North Attleboro | 50 | D | 0 | $458K |
| 55 | 2191 | North Weymouth | 45 | D | 0 | $492K |
Recommended Buyer Guides for Norfolk County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Lead Paint Test Kits — 75.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Norfolk County, Massachusetts
Overview
Norfolk County in Massachusetts covers 55 ZIP codes with an average Home Safety Score of C (66/100).
18 of 55 ZIP codes have recorded EPA violations. 19 health-based violations have been documented.
← Back to Massachusetts 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.