OCOTILLO OASIS, LLC
California - Community Water System - PWSID: CA3700291
System Information
| PWSID | CA3700291 |
| System Name | OCOTILLO OASIS, LLC |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | SAN MARCOS |
| ZIP Code | 92078 |
| Address | 663 S. Rancho Santa Fe Rd. |
| Organization | HEARN, KRISTI |
| Phone | 760-809-6964 |
Population & Service
| Population Served | 96 |
| Service Connections | 55 |
Drinking Water Violations (123)
This water system has 123 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug 1, 2024 | Aug 31, 2024 | MR | No | Yes | - | 10 mg/L | - | Archived | Aug 31, 2024 | - | |
| Jul 1, 2024 | Jul 31, 2024 | MR | No | Yes | - | 10 mg/L | - | Archived | Jul 31, 2024 | - | |
| Jul 1, 2024 | Sep 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Sep 30, 2024 | - | |
| Apr 1, 2024 | Jun 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jun 30, 2024 | - | |
| Apr 1, 2024 | Jun 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jun 30, 2024 | - | |
| Apr 1, 2024 | Jun 30, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jun 30, 2024 | - | |
| Feb 1, 2024 | Feb 29, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Feb 29, 2024 | - | |
| Feb 1, 2024 | Feb 29, 2024 | MR | No | Yes | - | 10 mg/L | - | Archived | Feb 29, 2024 | - | |
| Jan 1, 2024 | Mar 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2024 | - | |
| Jan 1, 2024 | Mar 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2024 | - | |
| Jan 1, 2024 | Mar 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2024 | - | |
| Jan 1, 2024 | Jan 31, 2024 | MR | No | Yes | - | 10 mg/L | - | Archived | Jan 31, 2024 | - | |
| Jan 1, 2024 | Jan 31, 2024 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jan 31, 2024 | - | |
| Dec 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2023 | - | |
| Dec 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Dec 31, 2023 | - | |
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Nov 30, 2023 | - | |
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Nov 30, 2023 | - | |
| Oct 31, 2023 | Dec 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2023 | - | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2023 | - | |
| Oct 1, 2023 | - | MR | No | No | - | TT | - | Addressed | - | - | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Oct 31, 2023 | - | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Oct 31, 2023 | - | |
| Oct 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2023 | - | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Sep 30, 2023 | - | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Sep 30, 2023 | - | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Sep 30, 2023 | - | |
| Aug 1, 2023 | Aug 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Aug 31, 2023 | - | |
| Jul 1, 2023 | Jul 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Jul 31, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Sep 30, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Sep 30, 2023 | - | |
| Jul 1, 2023 | Jul 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jul 31, 2023 | - | |
| Jul 1, 2023 | Sep 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Sep 30, 2023 | - | |
| Apr 1, 2023 | Jun 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jun 30, 2023 | - | |
| Apr 1, 2023 | Jun 30, 2023 | MCL | Yes | No | 3 MG/L | 4.0 mg/L | 2 | Archived | Jun 30, 2023 | - | |
| Apr 1, 2023 | Jun 30, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Jun 30, 2023 | - | |
| Apr 1, 2023 | Jun 30, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jun 30, 2023 | - | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Dec 31, 2023 | - | |
| Jan 1, 2023 | Jan 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Jan 31, 2023 | - | |
| Jan 1, 2023 | Mar 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Mar 31, 2023 | - | |
| Jan 1, 2023 | Mar 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2023 | - | |
| Jan 1, 2023 | Mar 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2023 | - | |
| Jan 1, 2023 | Jan 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Jan 31, 2023 | - | |
| Jan 1, 2023 | Mar 31, 2023 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Mar 31, 2023 | - | |
| Jan 1, 2023 | Dec 31, 2023 | MR | No | Yes | - | 10 mg/L | - | Archived | Dec 31, 2023 | - | |
| Jan 1, 2023 | Mar 31, 2023 | MCL | Yes | No | 2.31 MG/L | 4.0 mg/L | 2 | Archived | Mar 31, 2023 | - | |
| Dec 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2022 | - | |
| Dec 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 10 mg/L | - | Archived | Dec 31, 2022 | - | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2022 | - | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2022 | - | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 4.0 mg/L | - | Archived | Dec 31, 2022 | - |
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.