SAN YSIDRO WATER SUPPLY SYSTEM
PWSID: NM3509723 · San Ysidro, NM · Serves 166 people
According to EPA Safe Drinking Water Information System (SDWIS), SAN YSIDRO WATER SUPPLY SYSTEM (PWSID NM3509723) in San Ysidro, NM is listed as a CWS water system covering about 166 people. The same extract lists 102 health-based violation records spanning 2012-2025. Those 102 health-based rows for SAN YSIDRO WATER SUPPLY SYSTEM cover contaminants such as Fluoride, Arsenic, Groundwater Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
SAN YSIDRO WATER SUPPLY SYSTEM has 102 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 5 distinct EPA contaminant codes appear in this system's record, including Fluoride, Arsenic, Groundwater Rule. Recorded violations span 2012–2025. Day-to-day primacy enforcement for this system runs through the New Mexico drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current 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 |
|---|---|---|
| Fluoride | 83 | 83 |
| Arsenic | 12 | 12 |
| Groundwater Rule | 4 | 4 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 2 | 2 |
| LEAD AND COPPER RULE REVISIONS | 1 | 1 |
Violation History (102)
| Contaminant | Health | Date |
|---|---|---|
| Groundwater Rule | Yes | Jul 12, 2025 |
| Groundwater Rule | Yes | Jul 12, 2025 |
| LEAD AND COPPER RULE REVISIONS | Yes | Oct 17, 2024 |
| Fluoride | Yes | Jul 1, 2024 |
| Fluoride | Yes | Jul 1, 2024 |
| Fluoride | Yes | Apr 1, 2024 |
| Fluoride | Yes | Apr 1, 2024 |
| Fluoride | Yes | Apr 1, 2024 |
| Fluoride | Yes | Apr 1, 2024 |
| Fluoride | Yes | Jan 1, 2024 |
| Fluoride | Yes | Jan 1, 2024 |
| Fluoride | Yes | Jan 1, 2024 |
| Fluoride | Yes | Jan 1, 2024 |
| Fluoride | Yes | Oct 1, 2023 |
| Fluoride | Yes | Oct 1, 2023 |
| Fluoride | Yes | Oct 1, 2023 |
| Fluoride | Yes | Jul 1, 2023 |
| Fluoride | Yes | Jul 1, 2023 |
| Fluoride | Yes | Jul 1, 2023 |
| Fluoride | Yes | Jul 1, 2023 |
| Fluoride | Yes | Jul 1, 2023 |
| Fluoride | Yes | Apr 1, 2023 |
| Fluoride | Yes | Apr 1, 2023 |
| Fluoride | Yes | Apr 1, 2023 |
| Fluoride | Yes | Apr 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Arsenic | Yes | Apr 1, 2023 |
| Fluoride | Yes | Jan 1, 2023 |
| Fluoride | Yes | Jan 1, 2023 |
| Fluoride | Yes | Jan 1, 2023 |
| Fluoride | Yes | Jan 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Arsenic | Yes | Jan 1, 2023 |
| Fluoride | Yes | Oct 1, 2022 |
| Fluoride | Yes | Oct 1, 2022 |
| Fluoride | Yes | Oct 1, 2022 |
| Fluoride | Yes | Oct 1, 2022 |
| Arsenic | Yes | Oct 1, 2022 |
| Arsenic | Yes | Oct 1, 2022 |
| Fluoride | Yes | Jul 1, 2022 |
| Fluoride | Yes | Jul 1, 2022 |
| Fluoride | Yes | Jul 1, 2022 |
| Fluoride | Yes | Jul 1, 2022 |
| Arsenic | Yes | Jul 1, 2022 |
| Arsenic | Yes | Jul 1, 2022 |
| Fluoride | Yes | Apr 1, 2022 |
| Fluoride | Yes | Apr 1, 2022 |
| Fluoride | Yes | Apr 1, 2022 |
| Fluoride | Yes | Apr 1, 2022 |
| Fluoride | Yes | Jan 1, 2022 |
| Fluoride | Yes | Jan 1, 2022 |
| Fluoride | Yes | Jan 1, 2022 |
| Fluoride | Yes | Oct 1, 2021 |
| Fluoride | Yes | Oct 1, 2021 |
| Fluoride | Yes | Oct 1, 2021 |
| Fluoride | Yes | Jul 1, 2021 |
| Fluoride | Yes | Jul 1, 2021 |
| Fluoride | Yes | Jul 1, 2021 |
| Fluoride | Yes | Apr 1, 2021 |
| Fluoride | Yes | Apr 1, 2021 |
| Fluoride | Yes | Jan 1, 2021 |
| Fluoride | Yes | Jan 1, 2021 |
| Fluoride | Yes | Oct 1, 2020 |
| Fluoride | Yes | Oct 1, 2020 |
| Fluoride | Yes | Jul 1, 2020 |
| Fluoride | Yes | Jul 1, 2020 |
| Fluoride | Yes | Apr 1, 2020 |
| Fluoride | Yes | Apr 1, 2020 |
| Groundwater Rule | Yes | Jul 8, 2017 |
| Groundwater Rule | Yes | Jul 8, 2017 |
| Fluoride | Yes | Apr 1, 2017 |
| Fluoride | Yes | Apr 1, 2017 |
| Fluoride | Yes | Jan 1, 2017 |
| Fluoride | Yes | Jan 1, 2017 |
| Fluoride | Yes | Oct 1, 2016 |
| Fluoride | Yes | Oct 1, 2016 |
| Fluoride | Yes | Jul 1, 2016 |
| Fluoride | Yes | Jul 1, 2016 |
| Fluoride | Yes | Apr 1, 2016 |
| Fluoride | Yes | Apr 1, 2016 |
| Fluoride | Yes | Jan 1, 2016 |
| Fluoride | Yes | Jan 1, 2016 |
| Fluoride | Yes | Oct 1, 2015 |
| Fluoride | Yes | Oct 1, 2015 |
| Fluoride | Yes | Jul 1, 2015 |
| Fluoride | Yes | Jul 1, 2015 |
| Fluoride | Yes | Apr 1, 2015 |
| Fluoride | Yes | Apr 1, 2015 |
| Fluoride | Yes | Jan 1, 2015 |
| Fluoride | Yes | Jan 1, 2015 |
| Fluoride | Yes | Oct 1, 2014 |
| Fluoride | Yes | Oct 1, 2014 |
| Fluoride | Yes | Jul 1, 2014 |
| Fluoride | Yes | Jul 1, 2014 |
| Fluoride | Yes | Apr 1, 2014 |
| Fluoride | Yes | Apr 1, 2014 |
Frequently Asked Questions
What does EPA SDWIS list for SAN YSIDRO WATER SUPPLY SYSTEM?
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?
Compare beyond New Mexico
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest SAN YSIDRO WATER SUPPLY SYSTEM on cumulative violation count (102) and EPA-reported population served (166). Violation-count peers include HOLUM WATER SYSTEM, CITY OF STRAWN, CITY OF JACKSON.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Nearby Water Systems
Explore More
About This Data
SAN YSIDRO WATER SUPPLY SYSTEM (NM3509723) is drawn from EPA SDWIS. Nearby county systems in this extract include RIO RANCHO WATER & WW SERVICES; LOS ALAMOS MUNICIPAL WATER SYSTEM; BERNALILLO WATER SYSTEM; Santo Domingo Pueblo. Health-based rows (102 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.