Community Water System · PWS MD0050005
Town of Preston
Operator location Preston, Maryland - smaller served population (≤ 999) at 750 people served; 43 SDWIS violations on record from groundwater sources.
- 750
- People served (this PWS)
- 43
- EPA violations (this PWS)
- 5
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Town of Preston standing, mid SDWIS violation third
750 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%). Population rank #23,385 of 29,740 among systems serving 500+.
The verdict
Town of Preston lands in the middle third by violation volume (43), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (750; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #23,385 of 29,740
- Population · /systems
- #271 of 437
- Population · MD
- 43
- Total EPA violations on record
- 12%
- 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
- Local
- Connections
- 343
- County
- Caroline
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 34
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 15 | 2009 |
| Fluoride | MR | 4 | 2019 |
| Nitrate | MR | 4 | 2021 |
| Coliform (TCR) | MCL | 4 | 2000 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2020 |
| TTHM | MR | 4 | 2020 |
| Lead and Copper Rule | MR | 3 | 2020 |
| Consumer Confidence Rule | Other | 2 | 2008 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
Town of Preston has 43 recorded EPA violations, 52% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 47% carry more. 12% of this system's own violations are health-based (5 of 43), and it ranks #23,385 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)
43 Around the middle fewer violations than 47% 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 Town of Preston
EPA SDWIS lists 750 people served and 343 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
43 violations · 750 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Town of Preston
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Maryland compares on the same EPA violation measures. Maryland 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.