San Carlos High School
Arizona — Non-Transient Non-Community — PWSID: 090400701
System Information
| PWSID | 090400701 |
| System Name | San Carlos High School |
| System Type | Non-Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | Yes |
| Wholesaler | No |
| First Reported | Jun 28, 2003 |
| Last Reported | Dec 31, 2025 |
Location & Contact
| State | Arizona |
| City | San Carlos |
| ZIP Code | 85550 |
| Address | — |
| Organization | San Carlos Unified School District #20 |
| Phone | 9284752315 |
Population & Service
| Population Served | 626 |
| Service Connections | 9 |
Drinking Water Violations (208)
This water system has 208 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 1, 2024 | — | Public Notice | Other | No | No | — | — | — | Resolved | Jun 30, 2025 | Public Notice Rule and Revised PN Rule |
| Nov 1, 2024 | — | Public Notice | Other | No | No | — | — | — | Resolved | Jun 30, 2025 | Public Notice Rule and Revised PN Rule |
| Nov 1, 2024 | Nov 30, 2024 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Nov 30, 2024 | Revised Total Coliform Rule |
| Nov 1, 2024 | — | Public Notice | Other | No | No | — | — | — | Resolved | Jun 30, 2025 | Public Notice Rule and Revised PN Rule |
| Oct 1, 2024 | Dec 31, 2024 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2024 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2024 | Dec 31, 2024 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2024 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2024 | Dec 31, 2024 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2024 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2024 | Dec 31, 2024 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Archived | Dec 31, 2024 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2024 | Dec 31, 2024 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Archived | Dec 31, 2024 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2023 | Dec 31, 2023 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2023 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2023 | Jan 31, 2023 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Jan 31, 2023 | Revised Total Coliform Rule |
| Jan 1, 2023 | Mar 31, 2023 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Mar 31, 2023 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Dec 1, 2022 | Dec 31, 2022 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | Revised Total Coliform Rule |
| Oct 1, 2022 | Dec 31, 2022 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2022 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2022 | Jun 30, 2022 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | May 26, 2022 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2022 | Dec 31, 2022 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2022 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2022 | Dec 31, 2022 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2022 | Nitrate Rule |
| Jan 1, 2022 | Dec 31, 2022 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2022 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2021 | Dec 31, 2021 | Chlorine | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2021 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2020 | Dec 31, 2022 | Arsenic | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2022 | Arsenic Rule |
| Jul 1, 2013 | Jul 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2013 | Total Coliform Rule |
| Aug 1, 2010 | Aug 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2010 | Total Coliform Rule |
| Jul 1, 2010 | — | E. COLI | MR | No | Yes | — | — | — | Resolved | Jan 25, 2011 | Ground Water Rule |
| Jul 1, 2010 | Jul 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 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 |
| May 1, 2010 | May 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2010 | Total Coliform Rule |
| Apr 1, 2010 | Apr 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2010 | Total Coliform Rule |
| Mar 1, 2010 | Mar 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Mar 31, 2010 | Total Coliform Rule |
| Feb 1, 2010 | Feb 28, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2010 | Total Coliform Rule |
| Jan 1, 2010 | Dec 31, 2010 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2010 | Nitrate Rule |
| Jan 1, 2010 | Jan 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jan 31, 2010 | Total Coliform Rule |
| Jan 1, 2010 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 25, 2011 | Lead and Copper Rule |
| Dec 1, 2009 | Dec 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2009 | Total Coliform Rule |
| Nov 1, 2009 | Nov 30, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2009 | Total Coliform Rule |
| Oct 1, 2009 | Oct 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2009 | Total Coliform Rule |
| Sep 1, 2009 | Sep 30, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2009 | Total Coliform Rule |
| Aug 1, 2009 | Aug 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2009 | Total Coliform Rule |
| Jul 1, 2009 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 25, 2011 | Lead and Copper Rule |
| Jul 1, 2009 | Jul 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2009 | Total Coliform Rule |
| Apr 1, 2009 | Jun 30, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2009 | Total Coliform Rule |
| Jan 1, 2009 | Dec 31, 2009 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2009 | Nitrate Rule |
| Jan 1, 2009 | Dec 31, 2009 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | Dec 31, 2009 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 25, 2011 | Lead and Copper Rule |
| Jan 1, 2009 | Mar 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Mar 31, 2009 | Total Coliform Rule |
| Dec 1, 2008 | Dec 31, 2008 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2008 | Total Coliform Rule |
| Nov 1, 2008 | Nov 30, 2008 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2008 | Total Coliform Rule |
| Oct 1, 2008 | Oct 31, 2008 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2008 | Total Coliform Rule |
| Sep 1, 2008 | Sep 30, 2008 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2008 | Total Coliform Rule |
| Jul 1, 2008 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 25, 2011 | Lead and Copper Rule |
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.