Harris County, Texas
235 ZIP codes · Avg score 85/100 · Grade A · Updated 2026-06-03
The 235 water systems serving Harris County show strong compliance with federal drinking water standards.
How Harris County Compares
How Harris County Compares
Harris County scores 3 points above the Texas state average (82/100) and 17 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Harris County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12 (asthma 9.2%, diabetes 13.2%)
Estimated additional annual cost per homeowner: $2,645, driven primarily by flood
Infrastructure: 0.278% avg pipe failure probability, 6% of ZIPs at high risk
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Harris County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 216 violations. Past 5 years: 269 total (269 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: $2,645
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Harris County
Remediation costs are relatively manageable for most homeowners in Harris 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 Harris 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 Harris County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Houston | 2,970,543 | 232 |
| 2 | Clear Lake City Water Authority | 89,702 | 206 |
| 3 | Harris County Municipal Utility District 165 | 30,483 | 206 |
| 4 | City of Houston Utility District 5 - Kingwood | 80,073 | 204 |
| 5 | Bridgestone Municipal Utility District | 24,528 | 189 |
80 total water systems serve Harris County.
All ZIP Codes in Harris County
235 ZIP codes tracked in Harris County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 77097 | Houston | 98 | A | 1 (1 health) | — |
| 2 | 77201 | Houston | 98 | A | 1 (1 health) | — |
| 3 | 77202 | Houston | 98 | A | 1 (1 health) | — |
| 4 | 77203 | Houston | 98 | A | 1 (1 health) | — |
| 5 | 77204 | Houston | 98 | A | 1 (1 health) | — |
| 6 | 77209 | Houston | 98 | A | 1 (1 health) | — |
| 7 | 77212 | Houston | 98 | A | 1 (1 health) | — |
| 8 | 77215 | Houston | 98 | A | 1 (1 health) | — |
| 9 | 77216 | Houston | 98 | A | 1 (1 health) | — |
| 10 | 77217 | Houston | 98 | A | 1 (1 health) | — |
| 11 | 77218 | Houston | 98 | A | 1 (1 health) | — |
| 12 | 77219 | Houston | 98 | A | 1 (1 health) | — |
| 13 | 77222 | Houston | 98 | A | 1 (1 health) | — |
| 14 | 77223 | Houston | 98 | A | 1 (1 health) | — |
| 15 | 77226 | Houston | 98 | A | 1 (1 health) | — |
| 16 | 77230 | Houston | 98 | A | 1 (1 health) | — |
| 17 | 77231 | Houston | 98 | A | 1 (1 health) | — |
| 18 | 77241 | Houston | 98 | A | 1 (1 health) | — |
| 19 | 77243 | Houston | 98 | A | 1 (1 health) | — |
| 20 | 77246 | Houston | 98 | A | 1 (1 health) | — |
| 21 | 77247 | Houston | 98 | A | 1 (1 health) | — |
| 22 | 77248 | Houston | 98 | A | 1 (1 health) | — |
| 23 | 77249 | Houston | 98 | A | 1 (1 health) | — |
| 24 | 77250 | Houston | 98 | A | 1 (1 health) | — |
| 25 | 77254 | Houston | 98 | A | 1 (1 health) | — |
| 26 | 77259 | Houston | 98 | A | 1 (1 health) | — |
| 27 | 77260 | Houston | 98 | A | 1 (1 health) | — |
| 28 | 77263 | Houston | 98 | A | 1 (1 health) | — |
| 29 | 77268 | Houston | 98 | A | 1 (1 health) | — |
| 30 | 77269 | Houston | 98 | A | 1 (1 health) | — |
| 31 | 77271 | Houston | 98 | A | 1 (1 health) | — |
| 32 | 77273 | Houston | 98 | A | 1 (1 health) | — |
| 33 | 77274 | Houston | 98 | A | 1 (1 health) | — |
| 34 | 77275 | Houston | 98 | A | 1 (1 health) | — |
| 35 | 77276 | Houston | 98 | A | 1 (1 health) | — |
| 36 | 77277 | Houston | 98 | A | 1 (1 health) | — |
| 37 | 77278 | Houston | 98 | A | 1 (1 health) | — |
| 38 | 77280 | Houston | 98 | A | 1 (1 health) | — |
| 39 | 77282 | Houston | 98 | A | 1 (1 health) | — |
| 40 | 77284 | Houston | 98 | A | 1 (1 health) | — |
| 41 | 77285 | Houston | 98 | A | 1 (1 health) | — |
| 42 | 77286 | Houston | 98 | A | 1 (1 health) | — |
| 43 | 77288 | Houston | 98 | A | 1 (1 health) | — |
| 44 | 77289 | Houston | 98 | A | 1 (1 health) | — |
| 45 | 77290 | Houston | 98 | A | 1 (1 health) | — |
| 46 | 77291 | Houston | 98 | A | 1 (1 health) | — |
| 47 | 77292 | Houston | 98 | A | 1 (1 health) | — |
| 48 | 77293 | Houston | 98 | A | 1 (1 health) | — |
| 49 | 77294 | Houston | 98 | A | 1 (1 health) | — |
| 50 | 77296 | Houston | 98 | A | 1 (1 health) | — |
| 51 | 77297 | Houston | 98 | A | 1 (1 health) | — |
| 52 | 77298 | Houston | 98 | A | 1 (1 health) | — |
| 53 | 77299 | Houston | 98 | A | 1 (1 health) | — |
| 54 | 77383 | Spring | 95 | A | 1 | — |
| 55 | 77391 | Spring | 95 | A | 1 | — |
| 56 | 77010 | Houston | 94 | A | 1 (1 health) | — |
| 57 | 77206 | Houston | 94 | A | 1 (1 health) | — |
| 58 | 77207 | Houston | 94 | A | 1 (1 health) | — |
| 59 | 77208 | Houston | 94 | A | 1 (1 health) | — |
| 60 | 77213 | Houston | 94 | A | 1 (1 health) | — |
| 61 | 77220 | Houston | 94 | A | 1 (1 health) | — |
| 62 | 77221 | Houston | 94 | A | 1 (1 health) | — |
| 63 | 77224 | Houston | 94 | A | 1 (1 health) | — |
| 64 | 77225 | Houston | 94 | A | 1 (1 health) | — |
| 65 | 77228 | Houston | 94 | A | 1 (1 health) | — |
| 66 | 77229 | Houston | 94 | A | 1 (1 health) | — |
| 67 | 77233 | Houston | 94 | A | 1 (1 health) | — |
| 68 | 77235 | Houston | 94 | A | 1 (1 health) | — |
| 69 | 77236 | Houston | 94 | A | 1 (1 health) | — |
| 70 | 77237 | Houston | 94 | A | 1 (1 health) | — |
| 71 | 77238 | Houston | 94 | A | 1 (1 health) | — |
| 72 | 77240 | Houston | 94 | A | 1 (1 health) | — |
| 73 | 77242 | Houston | 94 | A | 1 (1 health) | — |
| 74 | 77244 | Houston | 94 | A | 1 (1 health) | — |
| 75 | 77245 | Houston | 94 | A | 1 (1 health) | — |
| 76 | 77251 | Houston | 94 | A | 1 (1 health) | — |
| 77 | 77253 | Houston | 94 | A | 1 (1 health) | — |
| 78 | 77255 | Houston | 94 | A | 1 (1 health) | — |
| 79 | 77256 | Houston | 94 | A | 1 (1 health) | — |
| 80 | 77257 | Houston | 94 | A | 1 (1 health) | — |
| 81 | 77258 | Houston | 94 | A | 1 (1 health) | — |
| 82 | 77261 | Houston | 94 | A | 1 (1 health) | — |
| 83 | 77265 | Houston | 94 | A | 1 (1 health) | — |
| 84 | 77266 | Houston | 94 | A | 1 (1 health) | — |
| 85 | 77270 | Houston | 94 | A | 1 (1 health) | — |
| 86 | 77272 | Houston | 94 | A | 1 (1 health) | — |
| 87 | 77279 | Houston | 94 | A | 1 (1 health) | — |
| 88 | 77287 | Houston | 94 | A | 1 (1 health) | — |
| 89 | 77487 | Sugar Land | 93 | A | 1 | — |
| 90 | 77492 | Katy | 93 | A | 1 | — |
| 91 | 77402 | Bellaire | 92 | A | 3 | — |
| 92 | 77857 | Gause | 91 | A | 3 (1 health) | $311K |
| 93 | 77413 | Barker | 90 | A | 140 (4 health) | — |
| 94 | 77001 | Houston | 89 | A | 1 (1 health) | — |
| 95 | 77046 | Houston | 89 | A | 1 (1 health) | $276K |
| 96 | 77210 | Houston | 89 | A | 1 (1 health) | — |
| 97 | 77227 | Houston | 89 | A | 1 (1 health) | — |
| 98 | 77234 | Houston | 89 | A | 1 (1 health) | — |
| 99 | 77252 | Houston | 89 | A | 1 (1 health) | — |
| 100 | 77262 | Houston | 89 | A | 1 (1 health) | — |
| 101 | 77347 | Humble | 89 | A | 0 | — |
| 102 | 77572 | La Porte | 89 | A | 2 | — |
| 103 | 77508 | Pasadena | 86 | A | 9 | — |
| 104 | 77003 | Houston | 84 | B | 1 (1 health) | $363K |
| 105 | 77011 | Houston | 84 | B | 1 (1 health) | $187K |
| 106 | 77012 | Houston | 84 | B | 1 (1 health) | $127K |
| 107 | 77014 | Houston | 84 | B | 1 (1 health) | $213K |
| 108 | 77020 | Houston | 84 | B | 1 (1 health) | $134K |
| 109 | 77052 | Houston | 84 | B | 1 (1 health) | — |
| 110 | 77054 | Houston | 84 | B | 1 (1 health) | $173K |
| 111 | 77085 | Houston | 84 | B | 1 (1 health) | $174K |
| 112 | 77094 | Houston | 84 | B | 1 (1 health) | $469K |
| 113 | 77205 | Houston | 84 | B | 1 (1 health) | — |
| 114 | 77522 | Baytown | 84 | B | 29 (1 health) | — |
| 115 | 77325 | Kingwood | 83 | B | 8 | — |
| 116 | 77501 | Pasadena | 81 | B | 9 | — |
| 117 | 77507 | Pasadena | 81 | B | 9 | — |
| 118 | 77547 | Galena Park | 81 | B | 3 (1 health) | $109K |
| 119 | 77388 | Spring | 80 | B | 1 | $265K |
| 120 | 77389 | Spring | 80 | B | 1 | $387K |
| 121 | 77598 | Webster | 80 | B | 0 | $229K |
| 122 | 77002 | Houston | 79 | B | 1 (1 health) | $286K |
| 123 | 77004 | Houston | 79 | B | 1 (1 health) | $384K |
| 124 | 77005 | Houston | 79 | B | 1 (1 health) | $1354K |
| 125 | 77006 | Houston | 79 | B | 1 (1 health) | $600K |
| 126 | 77007 | Houston | 79 | B | 1 (1 health) | $501K |
| 127 | 77009 | Houston | 79 | B | 1 (1 health) | $404K |
| 128 | 77017 | Houston | 79 | B | 1 (1 health) | $147K |
| 129 | 77021 | Houston | 79 | B | 1 (1 health) | $204K |
| 130 | 77023 | Houston | 79 | B | 1 (1 health) | $279K |
| 131 | 77027 | Houston | 79 | B | 1 (1 health) | $882K |
| 132 | 77029 | Houston | 79 | B | 1 (1 health) | $115K |
| 133 | 77030 | Houston | 79 | B | 1 (1 health) | $614K |
| 134 | 77031 | Houston | 79 | B | 1 (1 health) | $227K |
| 135 | 77033 | Houston | 79 | B | 1 (1 health) | $98K |
| 136 | 77036 | Houston | 79 | B | 1 (1 health) | $217K |
| 137 | 77041 | Houston | 79 | B | 1 (1 health) | $269K |
| 138 | 77043 | Houston | 79 | B | 1 (1 health) | $383K |
| 139 | 77047 | Houston | 79 | B | 1 (1 health) | $224K |
| 140 | 77048 | Houston | 79 | B | 1 (1 health) | $191K |
| 141 | 77050 | Houston | 79 | B | 1 (1 health) | $120K |
| 142 | 77051 | Houston | 79 | B | 1 (1 health) | $172K |
| 143 | 77053 | Houston | 79 | B | 1 (1 health) | $166K |
| 144 | 77055 | Houston | 79 | B | 1 (1 health) | $578K |
| 145 | 77056 | Houston | 79 | B | 1 (1 health) | $807K |
| 146 | 77057 | Houston | 79 | B | 1 (1 health) | $319K |
| 147 | 77059 | Houston | 79 | B | 1 (1 health) | $396K |
| 148 | 77061 | Houston | 79 | B | 1 (1 health) | $215K |
| 149 | 77063 | Houston | 79 | B | 1 (1 health) | $281K |
| 150 | 77064 | Houston | 79 | B | 1 (1 health) | $235K |
| 151 | 77065 | Houston | 79 | B | 1 (1 health) | $258K |
| 152 | 77067 | Houston | 79 | B | 1 (1 health) | $175K |
| 153 | 77068 | Houston | 79 | B | 1 (1 health) | $312K |
| 154 | 77069 | Houston | 79 | B | 1 (1 health) | $320K |
| 155 | 77071 | Houston | 79 | B | 1 (1 health) | $228K |
| 156 | 77073 | Houston | 79 | B | 1 (1 health) | $207K |
| 157 | 77078 | Houston | 79 | B | 1 (1 health) | $152K |
| 158 | 77081 | Houston | 79 | B | 1 (1 health) | $245K |
| 159 | 77083 | Houston | 79 | B | 1 (1 health) | $223K |
| 160 | 77086 | Houston | 79 | B | 1 (1 health) | $196K |
| 161 | 77091 | Houston | 79 | B | 1 (1 health) | $224K |
| 162 | 77092 | Houston | 79 | B | 1 (1 health) | $223K |
| 163 | 77095 | Houston | 79 | B | 1 (1 health) | $289K |
| 164 | 77098 | Houston | 79 | B | 1 (1 health) | $778K |
| 165 | 77346 | Humble | 79 | B | 0 | $291K |
| 166 | 77396 | Humble | 79 | B | 0 | $234K |
| 167 | 77375 | Tomball | 78 | B | 2 | $287K |
| 168 | 77377 | Tomball | 78 | B | 2 | $352K |
| 169 | 77493 | Katy | 78 | B | 1 | $322K |
| 170 | 77530 | Channelview | 78 | B | 5 | $171K |
| 171 | 77373 | Spring | 75 | B | 1 | $221K |
| 172 | 77379 | Spring | 75 | B | 1 | $336K |
| 173 | 77586 | Seabrook | 75 | B | 0 | $326K |
| 174 | 77587 | South Houston | 75 | B | 0 | $177K |
| 175 | 77008 | Houston | 74 | B | 1 (1 health) | $609K |
| 176 | 77013 | Houston | 74 | B | 1 (1 health) | $163K |
| 177 | 77015 | Houston | 74 | B | 1 (1 health) | $165K |
| 178 | 77016 | Houston | 74 | B | 1 (1 health) | $112K |
| 179 | 77018 | Houston | 74 | B | 1 (1 health) | $544K |
| 180 | 77022 | Houston | 74 | B | 1 (1 health) | $197K |
| 181 | 77024 | Houston | 74 | B | 1 (1 health) | $1164K |
| 182 | 77025 | Houston | 74 | B | 1 (1 health) | $521K |
| 183 | 77026 | Houston | 74 | B | 1 (1 health) | $105K |
| 184 | 77028 | Houston | 74 | B | 1 (1 health) | $108K |
| 185 | 77032 | Houston | 74 | B | 1 (1 health) | $123K |
| 186 | 77034 | Houston | 74 | B | 1 (1 health) | $178K |
| 187 | 77035 | Houston | 74 | B | 1 (1 health) | $260K |
| 188 | 77037 | Houston | 74 | B | 1 (1 health) | $161K |
| 189 | 77038 | Houston | 74 | B | 1 (1 health) | $174K |
| 190 | 77039 | Houston | 74 | B | 1 (1 health) | $149K |
| 191 | 77040 | Houston | 74 | B | 1 (1 health) | $224K |
| 192 | 77042 | Houston | 74 | B | 1 (1 health) | $371K |
| 193 | 77044 | Houston | 74 | B | 1 (1 health) | $275K |
| 194 | 77045 | Houston | 74 | B | 1 (1 health) | $164K |
| 195 | 77049 | Houston | 74 | B | 1 (1 health) | $208K |
| 196 | 77058 | Houston | 74 | B | 1 (1 health) | $245K |
| 197 | 77060 | Houston | 74 | B | 1 (1 health) | $145K |
| 198 | 77062 | Houston | 74 | B | 1 (1 health) | $280K |
| 199 | 77066 | Houston | 74 | B | 1 (1 health) | $218K |
| 200 | 77070 | Houston | 74 | B | 1 (1 health) | $264K |
| 201 | 77072 | Houston | 74 | B | 1 (1 health) | $175K |
| 202 | 77074 | Houston | 74 | B | 1 (1 health) | $202K |
| 203 | 77075 | Houston | 74 | B | 1 (1 health) | $220K |
| 204 | 77076 | Houston | 74 | B | 1 (1 health) | $148K |
| 205 | 77077 | Houston | 74 | B | 1 (1 health) | $356K |
| 206 | 77079 | Houston | 74 | B | 1 (1 health) | $636K |
| 207 | 77080 | Houston | 74 | B | 1 (1 health) | $312K |
| 208 | 77082 | Houston | 74 | B | 1 (1 health) | $226K |
| 209 | 77084 | Houston | 74 | B | 1 (1 health) | $233K |
| 210 | 77087 | Houston | 74 | B | 1 (1 health) | $148K |
| 211 | 77088 | Houston | 74 | B | 1 (1 health) | $174K |
| 212 | 77089 | Houston | 74 | B | 1 (1 health) | $237K |
| 213 | 77090 | Houston | 74 | B | 1 (1 health) | $236K |
| 214 | 77093 | Houston | 74 | B | 1 (1 health) | $122K |
| 215 | 77096 | Houston | 74 | B | 1 (1 health) | $410K |
| 216 | 77099 | Houston | 74 | B | 1 (1 health) | $177K |
| 217 | 77338 | Humble | 74 | B | 0 | $223K |
| 218 | 77520 | Baytown | 74 | B | 29 (1 health) | $144K |
| 219 | 77521 | Baytown | 74 | B | 29 (1 health) | $220K |
| 220 | 77571 | La Porte | 74 | B | 2 | $220K |
| 221 | 77401 | Bellaire | 72 | B | 3 | $978K |
| 222 | 77532 | Crosby | 72 | B | 1 | $244K |
| 223 | 77504 | Pasadena | 71 | B | 9 | $208K |
| 224 | 77506 | Pasadena | 71 | B | 9 | $132K |
| 225 | 77345 | Kingwood | 68 | C | 8 | $370K |
| 226 | 77562 | Highlands | 68 | C | 16 (4 health) | $195K |
| 227 | 77536 | Deer Park | 67 | C | 0 | $238K |
| 228 | 77410 | Cypress | 66 | C | 17 (9 health) | — |
| 229 | 77502 | Pasadena | 66 | C | 9 | $165K |
| 230 | 77503 | Pasadena | 66 | C | 9 | $165K |
| 231 | 77505 | Pasadena | 66 | C | 9 | $276K |
| 232 | 77339 | Kingwood | 63 | C | 8 | $275K |
| 233 | 77336 | Huffman | 55 | C | 0 | $266K |
| 234 | 77433 | Cypress | 55 | C | 17 (9 health) | $384K |
| 235 | 77429 | Cypress | 50 | D | 17 (9 health) | $342K |
Recommended Buyer Guides for Harris County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- 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 Harris County, Texas
Overview
Harris County in Texas covers 235 ZIP codes with an average Home Safety Score of A (85/100).
226 of 235 ZIP codes have recorded EPA violations. 228 health-based violations have been documented.
← Back to Texas 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.