Maricopa County, Arizona
197 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
The systems supplying Maricopa County's 197 ZIP codes vary in performance — most meet minimum standards, but violations in select areas are on record.
How Maricopa County Compares
How Maricopa County Compares
Maricopa County scores 0 points above the Arizona state average (64/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Maricopa County, Arizona
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.3 (asthma 10%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $1,753, driven primarily by wildfire
Infrastructure: 0.314% avg pipe failure probability, 15% of ZIPs at high risk
39.2% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Maricopa County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 255 violations. Past 5 years: 337 total (337 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: $1,753
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,812,645 housing units in Maricopa 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 Maricopa County
Remediation costs are relatively manageable for most homeowners in Maricopa 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 Maricopa 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 Maricopa County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Glendale | 234,766 | 10686 |
| 2 | City of Phoenix | 1,695,000 | 10405 |
| 3 | Pima Utilities | 20,000 | 9968 |
| 4 | Arizona Water Company - Apache Junction | 62,055 | 9849 |
| 5 | Arizona Water Company - Pinal Valley | 134,432 | 9828 |
87 total water systems serve Maricopa County.
All ZIP Codes in Maricopa County
197 ZIP codes tracked in Maricopa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 85342 | Morristown | 83 | B | 0 | $268K |
| 2 | 85377 | Carefree | 83 | B | 0 | $1059K |
| 3 | 85252 | Scottsdale | 82 | B | 21 (1 health) | — |
| 4 | 85256 | Scottsdale | 82 | B | 21 (1 health) | $132K |
| 5 | 85259 | Scottsdale | 82 | B | 21 (1 health) | $956K |
| 6 | 85261 | Scottsdale | 82 | B | 21 (1 health) | — |
| 7 | 85262 | Scottsdale | 82 | B | 21 (1 health) | $1179K |
| 8 | 85267 | Scottsdale | 82 | B | 21 (1 health) | — |
| 9 | 85271 | Scottsdale | 82 | B | 21 (1 health) | — |
| 10 | 85280 | Tempe | 82 | B | 24 (1 health) | — |
| 11 | 85282 | Tempe | 82 | B | 24 (1 health) | $370K |
| 12 | 85283 | Tempe | 82 | B | 24 (1 health) | $410K |
| 13 | 85284 | Tempe | 82 | B | 24 (1 health) | $646K |
| 14 | 85285 | Tempe | 82 | B | 24 (1 health) | — |
| 15 | 85287 | Tempe | 82 | B | 24 (1 health) | — |
| 16 | 85289 | Tempe | 82 | B | 24 (1 health) | — |
| 17 | 85338 | Goodyear | 82 | B | 11 (1 health) | $396K |
| 18 | 85340 | Litchfield Park | 82 | B | 10 (1 health) | $500K |
| 19 | 85354 | Tonopah | 82 | B | 3 | $278K |
| 20 | 85361 | Wittmann | 82 | B | 26 (1 health) | $389K |
| 21 | 85395 | Goodyear | 82 | B | 11 (1 health) | $525K |
| 22 | 85358 | Wickenburg | 81 | B | 22 (2 health) | — |
| 23 | 85392 | Avondale | 81 | B | 4 | $365K |
| 24 | 85127 | Chandler Heights | 80 | B | 3 | — |
| 25 | 85227 | Chandler Heights | 80 | B | 3 | — |
| 26 | 85263 | Rio Verde | 80 | B | 3 | $776K |
| 27 | 85224 | Chandler | 78 | B | 20 (2 health) | $391K |
| 28 | 85225 | Chandler | 78 | B | 20 (2 health) | $387K |
| 29 | 85226 | Chandler | 78 | B | 20 (2 health) | $452K |
| 30 | 85236 | Higley | 78 | B | 9 (1 health) | — |
| 31 | 85248 | Chandler | 78 | B | 20 (2 health) | $489K |
| 32 | 85249 | Chandler | 78 | B | 20 (2 health) | $611K |
| 33 | 85244 | Chandler | 77 | B | 20 (2 health) | — |
| 34 | 85250 | Scottsdale | 77 | B | 21 (1 health) | $508K |
| 35 | 85254 | Scottsdale | 77 | B | 21 (1 health) | $702K |
| 36 | 85257 | Scottsdale | 77 | B | 21 (1 health) | $453K |
| 37 | 85258 | Scottsdale | 77 | B | 21 (1 health) | $745K |
| 38 | 85260 | Scottsdale | 77 | B | 21 (1 health) | $637K |
| 39 | 85266 | Scottsdale | 77 | B | 21 (1 health) | $1027K |
| 40 | 85281 | Tempe | 77 | B | 24 (1 health) | $364K |
| 41 | 85286 | Chandler | 77 | B | 20 (2 health) | $549K |
| 42 | 85323 | Avondale | 76 | B | 4 | $335K |
| 43 | 85351 | Sun City | 76 | B | 9 | $250K |
| 44 | 85372 | Sun City | 76 | B | 9 | — |
| 45 | 85373 | Sun City | 76 | B | 9 | $317K |
| 46 | 85390 | Wickenburg | 76 | B | 22 (2 health) | $466K |
| 47 | 85337 | Gila Bend | 75 | B | 7 | $121K |
| 48 | 85142 | Queen Creek | 74 | B | 35 (1 health) | $521K |
| 49 | 85375 | Sun City West | 74 | B | 2 | $351K |
| 50 | 85202 | Mesa | 72 | B | 7 | $334K |
| 51 | 85204 | Mesa | 72 | B | 7 | $296K |
| 52 | 85205 | Mesa | 72 | B | 7 | $301K |
| 53 | 85207 | Mesa | 72 | B | 7 | $461K |
| 54 | 85208 | Mesa | 72 | B | 7 | $261K |
| 55 | 85209 | Mesa | 72 | B | 7 | $364K |
| 56 | 85210 | Mesa | 72 | B | 7 | $302K |
| 57 | 85211 | Mesa | 72 | B | 7 | — |
| 58 | 85212 | Mesa | 72 | B | 7 | $531K |
| 59 | 85213 | Mesa | 72 | B | 7 | $408K |
| 60 | 85214 | Mesa | 72 | B | 7 | — |
| 61 | 85215 | Mesa | 72 | B | 7 | $398K |
| 62 | 85216 | Mesa | 72 | B | 7 | — |
| 63 | 85251 | Scottsdale | 72 | B | 21 (1 health) | $501K |
| 64 | 85255 | Scottsdale | 72 | B | 21 (1 health) | $975K |
| 65 | 85274 | Mesa | 72 | B | 7 | — |
| 66 | 85275 | Mesa | 72 | B | 7 | — |
| 67 | 85277 | Mesa | 72 | B | 7 | — |
| 68 | 85303 | Glendale | 72 | B | 68 (8 health) | $287K |
| 69 | 85310 | Glendale | 72 | B | 68 (8 health) | $489K |
| 70 | 85320 | Aguila | 72 | B | 3 | $398K |
| 71 | 85376 | Sun City West | 71 | B | 2 | — |
| 72 | 85233 | Gilbert | 70 | B | 51 (4 health) | $469K |
| 73 | 85234 | Gilbert | 70 | B | 51 (4 health) | $489K |
| 74 | 85295 | Gilbert | 70 | B | 51 (4 health) | $527K |
| 75 | 85296 | Gilbert | 70 | B | 51 (4 health) | $496K |
| 76 | 85297 | Gilbert | 70 | B | 51 (4 health) | $559K |
| 77 | 85298 | Gilbert | 70 | B | 51 (4 health) | $598K |
| 78 | 85305 | Glendale | 69 | C | 68 (8 health) | $410K |
| 79 | 85307 | Glendale | 69 | C | 68 (8 health) | $369K |
| 80 | 85311 | Glendale | 69 | C | 68 (8 health) | — |
| 81 | 85312 | Glendale | 69 | C | 68 (8 health) | — |
| 82 | 85318 | Glendale | 69 | C | 68 (8 health) | — |
| 83 | 85327 | Cave Creek | 69 | C | 22 | — |
| 84 | 85381 | Peoria | 69 | C | 14 | $408K |
| 85 | 85382 | Peoria | 69 | C | 14 | $408K |
| 86 | 85383 | Peoria | 69 | C | 14 | $608K |
| 87 | 85396 | Buckeye | 69 | C | 19 | $451K |
| 88 | 85253 | Paradise Valley | 68 | C | 5 | $2000K |
| 89 | 85201 | Mesa | 67 | C | 7 | $293K |
| 90 | 85203 | Mesa | 67 | C | 7 | $388K |
| 91 | 85206 | Mesa | 67 | C | 7 | $323K |
| 92 | 85268 | Fountain Hills | 67 | C | 7 | $577K |
| 93 | 85299 | Gilbert | 67 | C | 51 (4 health) | — |
| 94 | 85301 | Glendale | 67 | C | 68 (8 health) | $218K |
| 95 | 85302 | Glendale | 67 | C | 68 (8 health) | $327K |
| 96 | 85304 | Glendale | 67 | C | 68 (8 health) | $345K |
| 97 | 85306 | Glendale | 67 | C | 68 (8 health) | $342K |
| 98 | 85308 | Glendale | 67 | C | 68 (8 health) | $420K |
| 99 | 85380 | Peoria | 67 | C | 14 | — |
| 100 | 85385 | Peoria | 67 | C | 14 | — |
| 101 | 85269 | Fountain Hills | 65 | C | 7 | — |
| 102 | 85087 | New River | 64 | C | 17 (8 health) | $511K |
| 103 | 85345 | Peoria | 64 | C | 14 | $278K |
| 104 | 85322 | Arlington | 63 | C | 0 | $237K |
| 105 | 85329 | Cashion | 63 | C | 0 | $244K |
| 106 | 85343 | Palo Verde | 63 | C | 0 | $550K |
| 107 | 85355 | Waddell | 63 | C | 0 | $444K |
| 108 | 85353 | Tolleson | 61 | C | 6 | $345K |
| 109 | 85326 | Buckeye | 59 | C | 19 | $342K |
| 110 | 85331 | Cave Creek | 59 | C | 22 | $674K |
| 111 | 85387 | Surprise | 59 | C | 24 (1 health) | $454K |
| 112 | 85001 | Phoenix | 58 | C | 126 (19 health) | — |
| 113 | 85003 | Phoenix | 58 | C | 126 (19 health) | $578K |
| 114 | 85004 | Phoenix | 58 | C | 126 (19 health) | $366K |
| 115 | 85005 | Phoenix | 58 | C | 126 (19 health) | — |
| 116 | 85006 | Phoenix | 58 | C | 126 (19 health) | $377K |
| 117 | 85027 | Phoenix | 58 | C | 126 (19 health) | $316K |
| 118 | 85028 | Phoenix | 58 | C | 126 (19 health) | $583K |
| 119 | 85030 | Phoenix | 58 | C | 126 (19 health) | — |
| 120 | 85035 | Phoenix | 58 | C | 126 (19 health) | $244K |
| 121 | 85036 | Phoenix | 58 | C | 126 (19 health) | — |
| 122 | 85037 | Phoenix | 58 | C | 126 (19 health) | $291K |
| 123 | 85040 | Phoenix | 58 | C | 126 (19 health) | $295K |
| 124 | 85042 | Phoenix | 58 | C | 126 (19 health) | $353K |
| 125 | 85043 | Phoenix | 58 | C | 126 (19 health) | $289K |
| 126 | 85044 | Phoenix | 58 | C | 126 (19 health) | $437K |
| 127 | 85048 | Phoenix | 58 | C | 126 (19 health) | $539K |
| 128 | 85050 | Phoenix | 58 | C | 126 (19 health) | $564K |
| 129 | 85054 | Phoenix | 58 | C | 126 (19 health) | $618K |
| 130 | 85060 | Phoenix | 58 | C | 126 (19 health) | — |
| 131 | 85061 | Phoenix | 58 | C | 126 (19 health) | — |
| 132 | 85064 | Phoenix | 58 | C | 126 (19 health) | — |
| 133 | 85067 | Phoenix | 58 | C | 126 (19 health) | — |
| 134 | 85083 | Phoenix | 58 | C | 126 (19 health) | $573K |
| 135 | 85085 | Phoenix | 58 | C | 126 (19 health) | $589K |
| 136 | 85335 | El Mirage | 55 | C | 66 (2 health) | $282K |
| 137 | 85007 | Phoenix | 53 | D | 126 (19 health) | $447K |
| 138 | 85009 | Phoenix | 53 | D | 126 (19 health) | $215K |
| 139 | 85012 | Phoenix | 53 | D | 126 (19 health) | $701K |
| 140 | 85017 | Phoenix | 53 | D | 126 (19 health) | $243K |
| 141 | 85019 | Phoenix | 53 | D | 126 (19 health) | $256K |
| 142 | 85022 | Phoenix | 53 | D | 126 (19 health) | $386K |
| 143 | 85023 | Phoenix | 53 | D | 126 (19 health) | $359K |
| 144 | 85029 | Phoenix | 53 | D | 126 (19 health) | $308K |
| 145 | 85032 | Phoenix | 53 | D | 126 (19 health) | $388K |
| 146 | 85033 | Phoenix | 53 | D | 126 (19 health) | $246K |
| 147 | 85034 | Phoenix | 53 | D | 126 (19 health) | $397K |
| 148 | 85041 | Phoenix | 53 | D | 126 (19 health) | $310K |
| 149 | 85051 | Phoenix | 53 | D | 126 (19 health) | $288K |
| 150 | 85086 | Phoenix | 53 | D | 126 (19 health) | $554K |
| 151 | 85147 | Sacaton | 53 | D | 0 | $107K |
| 152 | 85264 | Fort Mcdowell | 53 | D | 0 | $390K |
| 153 | 85363 | Youngtown | 53 | D | 0 | $283K |
| 154 | 85374 | Surprise | 52 | D | 24 (1 health) | $356K |
| 155 | 85378 | Surprise | 52 | D | 24 (1 health) | $235K |
| 156 | 85379 | Surprise | 52 | D | 24 (1 health) | $414K |
| 157 | 85388 | Surprise | 52 | D | 24 (1 health) | $420K |
| 158 | 85002 | Phoenix | 50 | D | 126 (19 health) | — |
| 159 | 85010 | Phoenix | 50 | D | 126 (19 health) | — |
| 160 | 85011 | Phoenix | 50 | D | 126 (19 health) | — |
| 161 | 85024 | Phoenix | 50 | D | 126 (19 health) | $430K |
| 162 | 85025 | Phoenix | 50 | D | 126 (19 health) | — |
| 163 | 85026 | Phoenix | 50 | D | 126 (19 health) | — |
| 164 | 85038 | Phoenix | 50 | D | 126 (19 health) | — |
| 165 | 85039 | Phoenix | 50 | D | 126 (19 health) | — |
| 166 | 85045 | Phoenix | 50 | D | 126 (19 health) | $591K |
| 167 | 85046 | Phoenix | 50 | D | 126 (19 health) | — |
| 168 | 85053 | Phoenix | 50 | D | 126 (19 health) | $330K |
| 169 | 85055 | Phoenix | 50 | D | 126 (19 health) | — |
| 170 | 85062 | Phoenix | 50 | D | 126 (19 health) | — |
| 171 | 85063 | Phoenix | 50 | D | 126 (19 health) | — |
| 172 | 85065 | Phoenix | 50 | D | 126 (19 health) | — |
| 173 | 85066 | Phoenix | 50 | D | 126 (19 health) | — |
| 174 | 85068 | Phoenix | 50 | D | 126 (19 health) | — |
| 175 | 85069 | Phoenix | 50 | D | 126 (19 health) | — |
| 176 | 85070 | Phoenix | 50 | D | 126 (19 health) | — |
| 177 | 85071 | Phoenix | 50 | D | 126 (19 health) | — |
| 178 | 85072 | Phoenix | 50 | D | 126 (19 health) | — |
| 179 | 85073 | Phoenix | 50 | D | 126 (19 health) | — |
| 180 | 85074 | Phoenix | 50 | D | 126 (19 health) | — |
| 181 | 85075 | Phoenix | 50 | D | 126 (19 health) | — |
| 182 | 85076 | Phoenix | 50 | D | 126 (19 health) | — |
| 183 | 85078 | Phoenix | 50 | D | 126 (19 health) | — |
| 184 | 85079 | Phoenix | 50 | D | 126 (19 health) | — |
| 185 | 85080 | Phoenix | 50 | D | 126 (19 health) | — |
| 186 | 85082 | Phoenix | 50 | D | 126 (19 health) | — |
| 187 | 85097 | Phoenix | 50 | D | 126 (19 health) | — |
| 188 | 85098 | Phoenix | 50 | D | 126 (19 health) | — |
| 189 | 85008 | Phoenix | 48 | D | 126 (19 health) | $324K |
| 190 | 85013 | Phoenix | 48 | D | 126 (19 health) | $476K |
| 191 | 85014 | Phoenix | 48 | D | 126 (19 health) | $448K |
| 192 | 85015 | Phoenix | 48 | D | 126 (19 health) | $313K |
| 193 | 85016 | Phoenix | 48 | D | 126 (19 health) | $508K |
| 194 | 85018 | Phoenix | 48 | D | 126 (19 health) | $806K |
| 195 | 85020 | Phoenix | 48 | D | 126 (19 health) | $401K |
| 196 | 85021 | Phoenix | 48 | D | 126 (19 health) | $433K |
| 197 | 85031 | Phoenix | 48 | D | 126 (19 health) | $240K |
Recommended Buyer Guides for Maricopa County
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Maricopa County, Arizona
Overview
Maricopa County in Arizona covers 197 ZIP codes with an average Home Safety Score of C (64/100).
188 of 197 ZIP codes have recorded EPA violations. 1668 health-based violations have been documented.
← Back to Arizona 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.