Community Water System · PWS TX0860086
Northwest Hills Water Supply
Operator location Austin, Texas - smaller served population (≤ 999) at 219 people served; 118 SDWIS violations on record from groundwater sources.
- 219
- People served (this PWS)
- 118
- EPA violations (this PWS)
- 20
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Northwest Hills Water Supply standing, high SDWIS violation third
219 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 17% is middle-third health share (≤ 23%).
The verdict
Northwest Hills Water Supply sits in the upper third of the sitemap cohort by violation count (118), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (219; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 17% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 118
- Total EPA violations on record
- 17%
- Health-based (MCL / treatment failure)
- 219
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 73
- County
- Gillespie
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 82
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Uranium | MR | 22 | 2014 |
| Combined Radium (-226 and -228) | MR | 22 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 22 | 2014 |
| Lead and Copper Rule | MR | 16 | 2021 |
| Combined Radium (-226 and -228) | MCL | 14 | 2013 |
| Public Notice | Other | 12 | 2016 |
| Gross Alpha, Excl. Radon and U | MCL | 6 | 1999 |
Violation Count vs. the National Corpus
Northwest Hills Water Supply has 118 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 17% of this system's own violations are health-based (20 of 118), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
118 Higher than most more violations than 76% 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
Population served record for Northwest Hills Water Supply
EPA SDWIS lists 219 people served and 73 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Nationwide peers
118 violations · 219 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Northwest Hills Water Supply
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.