San Ysidro Water Quality
New Mexico
According to EPA SDWIS, San Ysidro, New Mexico is served by 1 community water system covering about 166 people. The same extract lists 102 health-based violation records, most recently coded 0700 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in San Ysidro, New Mexico is delivered through 1 EPA-regulated community water system serving an estimated 166 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 102 violation records across the 1 active community system shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Groundwater Rule, LEAD AND COPPER RULE REVISIONS, Fluoride, Arsenic, Stage 1 Disinfectants and Disinfection Byproducts Rule.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the New Mexico drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| SAN YSIDRO WATER SUPPLY SYSTEM | 166 | 102 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| SAN YSIDRO WATER SUPPLY SYSTEM | Groundwater Rule | 2025-07-12 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Groundwater Rule | 2025-07-12 |
| SAN YSIDRO WATER SUPPLY SYSTEM | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2024-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-04-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2023-01-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2022-10-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Arsenic | 2022-07-01 |
| SAN YSIDRO WATER SUPPLY SYSTEM | Fluoride | 2022-04-01 |
What are San Ysidro's health-based records for?
San Ysidro's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Fluoride | 83 | 1 |
| Arsenic | 12 | 1 |
| Groundwater Rule | 4 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 2 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in San Ysidro, New Mexico? ▼
How many water violations does San Ysidro have in this EPA extract? ▼
What contaminants were found in San Ysidro water? ▼
How many water systems serve San Ysidro? ▼
Where does San Ysidro get its drinking water? ▼
How does San Ysidro compare in New Mexico?
Of the 255 New Mexico places with at least one community water system on file, San Ysidro ranks #221 by number of systems (1).
Either side of it: San Lorenzo (1), San Rafael (1), Santa Ana Pueblo (1), Santa Cruz (1)
About This Data
Figures here are the current EPA SDWIS extract joined to the 1 community water system whose service area lists San Ysidro, ranked against the 255 New Mexico places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.