Community Water System · PWS VI0000174
UVI St.Thomas
US Virgin Islands - smaller served population (≤ 999) at 900 people served; 7 SDWIS violations on record from groundwater sources.
- 900
- People served (this PWS)
- 7
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
UVI St.Thomas standing, low SDWIS violation third
900 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%). Population rank #21,209 of 29,740 among systems serving 500+.
The verdict
UVI St.Thomas is in the lower third by violation count (7; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is smaller (900; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #21,209 of 29,740
- Population · /systems
- #15 of 36
- Population · VI
- 7
- Total EPA violations on record
- 14%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- State
- Connections
- 1
- County
- St. Thomas Island
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 0
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 2 | 1999 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
UVI St.Thomas has 7 recorded EPA violations, 13% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 85% carry more. 14% of this system's own violations are health-based (1 of 7), and it ranks #21,209 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)
7 Among the lowest violation counts fewer violations than 85% 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 UVI St.Thomas
EPA SDWIS lists 900 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
7 violations · 900 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with UVI St.Thomas
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in US Virgin Islands compares on the same EPA violation measures. US Virgin Islands 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.