DELPHIAN SCHOOL
Oregon — Community Water System — PWSID: OR4100812
System Information
| PWSID | OR4100812 |
| System Name | DELPHIAN SCHOOL |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Mixed |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 12, 1979 |
| Last Reported | Dec 23, 2025 |
Location & Contact
| State | Oregon |
| City | SHERIDAN |
| ZIP Code | 97378 |
| Address | 20950 SW ROCK CREEK RD |
| Organization | DELPHIAN SCHOOL |
| Phone | 503-843-3521 |
Population & Service
| Population Served | 350 |
| Service Connections | 3 |
Drinking Water Violations (24)
This water system has 24 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, 2025 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Jul 29, 2025 | Consumer Confidence Rule |
| Jul 1, 2024 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Jul 29, 2025 | Consumer Confidence Rule |
| Dec 1, 2022 | Dec 31, 2022 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | Revised Total Coliform Rule |
| Sep 26, 2017 | — | E. COLI | MR | No | Yes | — | — | — | Resolved | Oct 13, 2017 | Ground Water Rule |
| Oct 1, 2014 | Sep 30, 2015 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Sep 30, 2015 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2014 | Sep 30, 2015 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Sep 30, 2015 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jul 1, 2010 | Jul 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2010 | Total Coliform Rule |
| Jul 1, 2010 | Jul 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 2010 | Total Coliform Rule |
| Jan 1, 2009 | Jan 31, 2009 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Jan 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | Jan 31, 2009 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Jan 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | Jan 31, 2009 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Jan 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2009 | Jan 31, 2009 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Jan 31, 2009 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Nov 1, 2008 | Nov 30, 2008 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2008 | Total Coliform Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Oct 1, 2001 | Oct 31, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2001 | Total Coliform Rule |
| Jan 1, 2000 | Dec 31, 2000 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2000 | Nitrate Rule |
| Jan 1, 1999 | Dec 31, 1999 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1999 | Nitrate Rule |
| Jan 1, 1998 | Dec 31, 1998 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1998 | Nitrate Rule |
| Jan 1, 1996 | Dec 31, 1999 | Gross Alpha, Excl. Radon and U | MR | No | Yes | — | 15 pCi/L | — | Resolved | Dec 31, 1999 | Radionuclides and Revised Rad Rule |
| Jul 1, 1994 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Feb 7, 1995 | Lead and Copper Rule |
| Jul 1, 1994 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Feb 7, 1995 | Lead and Copper Rule |
| Jan 1, 1994 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 5, 1994 | Lead and Copper Rule |
| Jun 1, 1976 | May 31, 1980 | Gross Alpha, Excl. Radon and U | MR | No | No | — | 15 pCi/L | — | Archived | May 31, 1980 | Radionuclides and Revised Rad Rule |
| Jun 1, 1976 | May 31, 1980 | Combined Radium (-226 and -228) | MR | No | No | — | 5 pCi/L | — | Archived | May 31, 1980 | Radionuclides and Revised Rad 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.