SAN YSIDRO WATER SUPPLY SYSTEM
PWSID: NM3509723 · San Ysidro, NM · Serves 166 people
SAN YSIDRO WATER SUPPLY SYSTEM has 102 health-based violations out of 102 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
SAN YSIDRO WATER SUPPLY SYSTEM (PWSID NM3509723) is a cws water system drawing from a groundwater source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 166 people in San Ysidro, NM, and is subject to primacy enforcement by the New Mexico drinking-water program.
The system's federal compliance record contains 102 total violations, with 102 classified as health-based (MCL exceedances or treatment-technique failures). 5 distinct contaminants have been cited, including Manganese, Barium, Fluoride. Recorded violations span 2012–2025.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the New Mexico state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- NM3509723
- System Type
- CWS
- Water Source
- Groundwater
- Location
- San Ysidro, NM
- Population Served
- 166
- Health Violations
- Yes (102)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Manganese | 83 | 83 |
| Barium | 12 | 12 |
| Fluoride | 4 | 4 |
| Chlorine | 2 | 2 |
| Gross Alpha | 1 | 1 |
Violation History (102)
| Contaminant | Health | Date |
|---|---|---|
| Fluoride | Yes | Jul 12, 2025 |
| Fluoride | Yes | Jul 12, 2025 |
| Gross Alpha | Yes | Oct 17, 2024 |
| Manganese | Yes | Jul 1, 2024 |
| Manganese | Yes | Jul 1, 2024 |
| Manganese | Yes | Apr 1, 2024 |
| Manganese | Yes | Apr 1, 2024 |
| Manganese | Yes | Apr 1, 2024 |
| Manganese | Yes | Apr 1, 2024 |
| Manganese | Yes | Jan 1, 2024 |
| Manganese | Yes | Jan 1, 2024 |
| Manganese | Yes | Jan 1, 2024 |
| Manganese | Yes | Jan 1, 2024 |
| Manganese | Yes | Oct 1, 2023 |
| Manganese | Yes | Oct 1, 2023 |
| Manganese | Yes | Oct 1, 2023 |
| Manganese | Yes | Jul 1, 2023 |
| Manganese | Yes | Jul 1, 2023 |
| Manganese | Yes | Jul 1, 2023 |
| Manganese | Yes | Jul 1, 2023 |
| Manganese | Yes | Jul 1, 2023 |
| Manganese | Yes | Apr 1, 2023 |
| Manganese | Yes | Apr 1, 2023 |
| Manganese | Yes | Apr 1, 2023 |
| Manganese | Yes | Apr 1, 2023 |
| Barium | Yes | Apr 1, 2023 |
| Barium | Yes | Apr 1, 2023 |
| Barium | Yes | Apr 1, 2023 |
| Barium | Yes | Apr 1, 2023 |
| Manganese | Yes | Jan 1, 2023 |
| Manganese | Yes | Jan 1, 2023 |
| Manganese | Yes | Jan 1, 2023 |
| Manganese | Yes | Jan 1, 2023 |
| Barium | Yes | Jan 1, 2023 |
| Barium | Yes | Jan 1, 2023 |
| Barium | Yes | Jan 1, 2023 |
| Barium | Yes | Jan 1, 2023 |
| Manganese | Yes | Oct 1, 2022 |
| Manganese | Yes | Oct 1, 2022 |
| Manganese | Yes | Oct 1, 2022 |
| Manganese | Yes | Oct 1, 2022 |
| Barium | Yes | Oct 1, 2022 |
| Barium | Yes | Oct 1, 2022 |
| Manganese | Yes | Jul 1, 2022 |
| Manganese | Yes | Jul 1, 2022 |
| Manganese | Yes | Jul 1, 2022 |
| Manganese | Yes | Jul 1, 2022 |
| Barium | Yes | Jul 1, 2022 |
| Barium | Yes | Jul 1, 2022 |
| Manganese | Yes | Apr 1, 2022 |
| Manganese | Yes | Apr 1, 2022 |
| Manganese | Yes | Apr 1, 2022 |
| Manganese | Yes | Apr 1, 2022 |
| Manganese | Yes | Jan 1, 2022 |
| Manganese | Yes | Jan 1, 2022 |
| Manganese | Yes | Jan 1, 2022 |
| Manganese | Yes | Oct 1, 2021 |
| Manganese | Yes | Oct 1, 2021 |
| Manganese | Yes | Oct 1, 2021 |
| Manganese | Yes | Jul 1, 2021 |
| Manganese | Yes | Jul 1, 2021 |
| Manganese | Yes | Jul 1, 2021 |
| Manganese | Yes | Apr 1, 2021 |
| Manganese | Yes | Apr 1, 2021 |
| Manganese | Yes | Jan 1, 2021 |
| Manganese | Yes | Jan 1, 2021 |
| Manganese | Yes | Oct 1, 2020 |
| Manganese | Yes | Oct 1, 2020 |
| Manganese | Yes | Jul 1, 2020 |
| Manganese | Yes | Jul 1, 2020 |
| Manganese | Yes | Apr 1, 2020 |
| Manganese | Yes | Apr 1, 2020 |
| Fluoride | Yes | Jul 8, 2017 |
| Fluoride | Yes | Jul 8, 2017 |
| Manganese | Yes | Apr 1, 2017 |
| Manganese | Yes | Apr 1, 2017 |
| Manganese | Yes | Jan 1, 2017 |
| Manganese | Yes | Jan 1, 2017 |
| Manganese | Yes | Oct 1, 2016 |
| Manganese | Yes | Oct 1, 2016 |
| Manganese | Yes | Jul 1, 2016 |
| Manganese | Yes | Jul 1, 2016 |
| Manganese | Yes | Apr 1, 2016 |
| Manganese | Yes | Apr 1, 2016 |
| Manganese | Yes | Jan 1, 2016 |
| Manganese | Yes | Jan 1, 2016 |
| Manganese | Yes | Oct 1, 2015 |
| Manganese | Yes | Oct 1, 2015 |
| Manganese | Yes | Jul 1, 2015 |
| Manganese | Yes | Jul 1, 2015 |
| Manganese | Yes | Apr 1, 2015 |
| Manganese | Yes | Apr 1, 2015 |
| Manganese | Yes | Jan 1, 2015 |
| Manganese | Yes | Jan 1, 2015 |
| Manganese | Yes | Oct 1, 2014 |
| Manganese | Yes | Oct 1, 2014 |
| Manganese | Yes | Jul 1, 2014 |
| Manganese | Yes | Jul 1, 2014 |
| Manganese | Yes | Apr 1, 2014 |
| Manganese | Yes | Apr 1, 2014 |
Frequently Asked Questions
Is SAN YSIDRO WATER SUPPLY SYSTEM water safe to drink?
How many people does SAN YSIDRO WATER SUPPLY SYSTEM serve?
What violations does SAN YSIDRO WATER SUPPLY SYSTEM have?
What contaminants have been found in SAN YSIDRO WATER SUPPLY SYSTEM water?
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About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.