DESERT OASIS
Arizona — Community Water System — PWSID: AZ0407523
System Information
| PWSID | AZ0407523 |
| System Name | DESERT OASIS |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Sep 21, 2004 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | Arizona |
| City | SURPRISE |
| ZIP Code | 85374 |
| Address | 16000 N. Civic Center Plaza |
| Organization | PEZZELLE, STEPHANIE R |
| Phone | 623-222-7030 |
Population & Service
| Population Served | 23,963 |
| Service Connections | 8,123 |
Drinking Water Violations (50)
This water system has 50 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2020 | Sep 30, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2020 | Arsenic Rule |
| Jul 1, 2020 | Sep 30, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2020 | Arsenic Rule |
| Apr 1, 2020 | Jun 30, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Jun 30, 2020 | Arsenic Rule |
| Apr 1, 2020 | Jun 30, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Jun 30, 2020 | Arsenic Rule |
| Jan 1, 2020 | Mar 31, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Mar 31, 2020 | Arsenic Rule |
| Jan 1, 2020 | Mar 31, 2020 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Mar 31, 2020 | Arsenic Rule |
| Oct 1, 2019 | Dec 31, 2019 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2019 | Arsenic Rule |
| Oct 1, 2019 | Dec 31, 2019 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2019 | Arsenic Rule |
| Oct 1, 2019 | Dec 31, 2019 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2019 | Arsenic Rule |
| Oct 1, 2019 | Dec 31, 2019 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2019 | Arsenic Rule |
| Jan 1, 2019 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 2, 2019 | Lead and Copper Rule |
| Jan 1, 2019 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 2, 2019 | Lead and Copper Rule |
| Jul 1, 2017 | Sep 30, 2017 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2017 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Feb 1, 2015 | Feb 28, 2015 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2015 | Total Coliform Rule |
| Feb 1, 2015 | Feb 28, 2015 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2015 | Total Coliform Rule |
| Oct 1, 2014 | Dec 31, 2014 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2014 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2014 | Dec 31, 2014 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2014 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2014 | Jun 30, 2014 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Jun 30, 2014 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jul 1, 2012 | Sep 30, 2012 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2012 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2010 | Dec 31, 2010 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2010 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Sep 1, 2010 | Sep 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2010 | Total Coliform Rule |
| Sep 1, 2010 | Sep 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2010 | Total Coliform Rule |
| Jul 1, 2010 | Sep 30, 2010 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2010 | Arsenic Rule |
| Jul 1, 2010 | Sep 30, 2010 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Sep 30, 2010 | Arsenic Rule |
| Jun 1, 2010 | Jun 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2010 | Total Coliform Rule |
| Jun 1, 2010 | Jun 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2010 | Total Coliform Rule |
| Oct 1, 2009 | Dec 31, 2009 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2009 | Arsenic Rule |
| Oct 1, 2009 | Dec 31, 2009 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2009 | Arsenic Rule |
| Jul 1, 2009 | Sep 30, 2009 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Sep 30, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jul 1, 2009 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Jul 15, 2009 | Consumer Confidence Rule |
| Oct 1, 2007 | Oct 31, 2007 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2007 | Total Coliform Rule |
| Sep 1, 2007 | Sep 30, 2007 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2007 | Total Coliform Rule |
| Aug 1, 2007 | Aug 31, 2007 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2007 | Total Coliform Rule |
| Jul 1, 2007 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Dec 31, 2007 | Consumer Confidence Rule |
| Jul 1, 2006 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Dec 31, 2006 | Consumer Confidence Rule |
| Sep 1, 2005 | Sep 30, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2005 | Total Coliform Rule |
| Aug 1, 2005 | Aug 31, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2005 | Total Coliform Rule |
| Jul 1, 2005 | Jul 31, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2005 | Total Coliform Rule |
| Jun 1, 2005 | Jun 30, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2005 | Total Coliform Rule |
| May 1, 2005 | May 31, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2005 | Total Coliform Rule |
| Apr 1, 2005 | Apr 30, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2005 | Total Coliform Rule |
| Mar 1, 2005 | Mar 31, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Mar 31, 2005 | Total Coliform Rule |
| Feb 1, 2005 | Feb 28, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2005 | Total Coliform Rule |
| Jan 1, 2005 | Jan 31, 2005 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2005 | Total Coliform Rule |
| Jan 1, 2004 | Dec 31, 2007 | Combined Uranium | MR | No | No | — | 30 ug/L | — | Resolved | Dec 31, 2007 | Radionuclides and Revised Rad Rule |
| Jan 1, 2004 | Dec 31, 2007 | Combined Radium (-226 and -228) | MR | No | No | — | 5 pCi/L | — | Resolved | Dec 31, 2007 | Radionuclides and Revised Rad Rule |
| Jan 1, 2004 | Dec 31, 2007 | Radium-226 | MR | No | No | — | — | — | Resolved | Dec 31, 2007 | Radionuclides and Revised Rad Rule |
| Jan 1, 2004 | Dec 31, 2007 | Gross Alpha, Excl. Radon and U | MR | No | No | — | 15 pCi/L | — | Resolved | Dec 31, 2007 | Radionuclides and Revised Rad Rule |
| Dec 1, 2003 | Dec 31, 2003 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2003 | Total Coliform Rule |
| — | — | — | No | No | — | — | — | — | — | — |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.