Community Water System · PWS AZ0412311
Town & Country - Preston
Operator location Nogales, Arizona - smaller served population (≤ 999) at 430 people served; 316 SDWIS violations on record from groundwater sources.
- 430
- People served (this PWS)
- 316
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Town & Country - Preston standing, high SDWIS violation third
430 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 3% is middle-third health share (≤ 23%).
The verdict
Town & Country - Preston sits in the upper third of the sitemap cohort by violation count (316), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (430; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 316
- Total EPA violations on record
- 3%
- Health-based (MCL / treatment failure)
- 430
- 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
- 90
- County
- Santa Cruz
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 217
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 55 | 2023 |
| Chlorine | MR | 47 | 2025 |
| Coliform (TCR) | MR | 27 | 2015 |
| Lead and Copper Rule | MR | 25 | 2025 |
| Nitrate | MR | 10 | 2021 |
| Public Notice | Other | 10 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 9 | 2017 |
| TTHM | MR | 9 | 2017 |
| Coliform (TCR) | MCL | 3 | 2000 |
| Tetrachloroethylene | MR | 3 | 2011 |
| E. COLI | MR | 3 | 2022 |
| Groundwater Rule | TT | 3 | 2025 |
| cis-1,2-Dichloroethylene | MR | 2 | 2011 |
| DICHLOROMETHANE | MR | 2 | 2011 |
| o-Dichlorobenzene | MR | 2 | 2011 |
| 1,1-Dichloroethylene | MR | 2 | 2011 |
| trans-1,2-Dichloroethylene | MR | 2 | 2011 |
| 1,2-Dichloroethane | MR | 2 | 2011 |
| 1,1,1-Trichloroethane | MR | 2 | 2011 |
| CHLOROBENZENE | MR | 2 | 2011 |
| Toluene | MR | 2 | 2011 |
| Ethylbenzene | MR | 2 | 2011 |
| Xylenes, Total | MR | 2 | 2011 |
| Carbon tetrachloride | MR | 2 | 2011 |
| 1,2-Dichloropropane | MR | 2 | 2011 |
| Benzene | MR | 2 | 2011 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| Styrene | MR | 2 | 2011 |
| p-Dichlorobenzene | MR | 2 | 2011 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2011 |
Violation Count vs. the National Corpus
Town & Country - Preston has 316 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 3% of this system's own violations are health-based (9 of 316), 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)
316 Higher than most more violations than 91% 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 & Country - Preston
EPA SDWIS lists 430 people served and 90 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
316 violations · 430 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 Town & Country - Preston
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arizona compares on the same EPA violation measures. Arizona 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.