Community Water System · PWS TX1010649
Harris County MUD 23
Operator location Houston, Texas - 38% of 37 violations are health-based (upper-third health share (> 23%)); surface water source; 3,170 served per SDWIS.
- 3,170
- People served (this PWS)
- 37
- EPA violations (this PWS)
- 14
- Health-based (this PWS)
- 3 PFAS
- UCMR5 (this PWS)
Harris County MUD 23 standing, mid SDWIS violation third
38% of 37 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 38% is upper-third health share (> 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #10,233 of 29,740 among systems serving 500+.
The verdict
Harris County MUD 23 lands in the middle third by violation volume (37), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 3,170 (mid served population (≤ 3,309)). Health-based share is 38% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 3 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #10,233 of 29,740
- Population · /systems
- #1,217 of 3,040
- Population · TX
- 37
- Total EPA violations on record
- 38%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,641
- County
- Harris
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 21
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MCL | 14 | 2013 |
| Lead and Copper Rule | MR | 2 | 2013 |
| Consumer Confidence Rule | Other | 2 | 2012 |
| Endrin | MR | 1 | 2011 |
| BHC-GAMMA | MR | 1 | 2011 |
| Methoxychlor | MR | 1 | 2011 |
| Toxaphene | MR | 1 | 2011 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2011 |
| Simazine | MR | 1 | 2011 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2011 |
| LASSO | MR | 1 | 2011 |
| HEXACHLOROBENZENE | MR | 1 | 2011 |
| Benzo(a)pyrene | MR | 1 | 2011 |
| Chlordane | MR | 1 | 2011 |
| Heptachlor | MR | 1 | 2011 |
| Heptachlor epoxide | MR | 1 | 2011 |
| Combined Radium (-226 and -228) | MR | 1 | 2009 |
| Pentachlorophenol | MR | 1 | 2011 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2009 |
| Atrazine | MR | 1 | 2011 |
| Hexachlorocyclopentadiene | MR | 1 | 2011 |
| Combined Uranium | MR | 1 | 2009 |
Violation Count vs. the National Corpus
Harris County MUD 23 has 37 recorded EPA violations, 48% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 51% carry more. 38% of this system's own violations are health-based (14 of 37), and it ranks #10,233 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
37 Lower than most fewer violations than 51% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 232 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 8/6/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFOA | 8/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/6/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFDA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/6/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFMPA | 8/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/6/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/6/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/6/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/6/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 5/6/2024 | 3.60 ppt | 3.00 ppt | Detected |
| PFDoA | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 5/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 5/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 5/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 5/6/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpA | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 5/6/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 5/6/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 5/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 5/6/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 5/6/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/6/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 5/6/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Harris County MUD 23
14 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for TX1010649.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
37 violations · 3,170 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Harris County MUD 23
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Texas compares on the same EPA violation measures. Texas systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.