Community Water System · PWS AZ0412005
Sonoita Valley (South) Water Company
Operator location Tucson, Arizona - smaller served population (≤ 999) at 169 people served; 165 SDWIS violations on record from groundwater sources.
- 169
- People served (this PWS)
- 165
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Sonoita Valley (South) Water Company standing, high SDWIS violation third
169 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%).
The verdict
Sonoita Valley (South) Water Company sits in the upper third of the sitemap cohort by violation count (165), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (169; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 165
- Total EPA violations on record
- 4%
- Health-based (MCL / treatment failure)
- 169
- 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
- 59
- County
- Santa Cruz
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 127
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MR | 29 | 2024 |
| Combined Uranium | MR | 24 | 2024 |
| Public Notice | Other | 9 | 2024 |
| Coliform (TCR) | MR | 8 | 2010 |
| Chlorine | MR | 6 | 2019 |
| Combined Uranium | MCL | 5 | 2012 |
| Consumer Confidence Rule | Other | 5 | 2019 |
| Lead and Copper Rule | MR | 4 | 2019 |
| Nitrate | MR | 3 | 2002 |
| DICHLOROMETHANE | MR | 2 | 2001 |
| o-Dichlorobenzene | MR | 2 | 2001 |
| trans-1,2-Dichloroethylene | MR | 2 | 2001 |
| 1,2-Dichloroethane | MR | 2 | 2001 |
| 1,1,1-Trichloroethane | MR | 2 | 2001 |
| Carbon tetrachloride | MR | 2 | 2001 |
| 1,2-Dichloropropane | MR | 2 | 2001 |
| CHLOROBENZENE | MR | 2 | 2001 |
| Benzene | MR | 2 | 2001 |
| Combined Radium (-226 and -228) | MR | 2 | 2013 |
| Radium-228 | MR | 2 | 2013 |
| Radium-226 | MR | 2 | 2013 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| cis-1,2-Dichloroethylene | MR | 2 | 2001 |
| 1,1-Dichloroethylene | MR | 2 | 2001 |
| 1,1,2-Trichloroethane | MR | 2 | 2001 |
| Tetrachloroethylene | MR | 2 | 2001 |
| p-Dichlorobenzene | MR | 2 | 2001 |
| Trichloroethylene | MR | 2 | 2001 |
| Toluene | MR | 2 | 2001 |
Violation Count vs. the National Corpus
Sonoita Valley (South) Water Company has 165 recorded EPA violations, 82% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 4% of this system's own violations are health-based (7 of 165), 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)
165 Higher than most more violations than 82% 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 Sonoita Valley (South) Water Company
EPA SDWIS lists 169 people served and 59 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
165 violations · 169 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 Sonoita Valley Water Company
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.