Costilla Mdwca
EPA ID: NM3505929 · 244 people served · 2 ZIP codes
Where compliant utilities carry no open actions, Costilla Mdwca shows 4 active EPA violations in the federal database for a service population of approximately 244.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Costilla Mdwca Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
💧 Where Does Your Water Come From?
Costilla Mdwca's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 2% of homes in Taos County, New Mexico rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Costilla Mdwca compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 5 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 1 presence exceeds the EPA maximum of presence.
Contaminant 0700 at 1 mg/L exceeds the EPA maximum of mg/L.
Comparable Water Systems
Similar-sized systems in New Mexico
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
COSTILLA MDWCA (EPA ID: NM3505929) is a community water system in New Mexico that serves approximately 244 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: D (51/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| April 7, 2024 | Contaminant 0700 | Monitoring | Unresolved |
| October 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Failure | 5 | No |
| Lead and Copper Rule | Treatment Failure | 4 | No |
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
| Revised Total Coliform Rule | Microbiological | 1 | No |
| Contaminant 0700 | Other Violation | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 87524 | 0.002 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Costilla Mdwca (NM3505929) on EPA.gov.
Frequently Asked Questions
Is Costilla Mdwca water safe to drink?
Costilla Mdwca has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Costilla Mdwca serve?
Costilla Mdwca serves approximately 244 people across 2 ZIP codes in New Mexico.
Where does Costilla Mdwca get its water?
The primary water source is groundwater.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: COSTILLA MDWCA Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment classification and chemical list sourced from COSTILLA MDWCA Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Federal compliance violations on record
These entries are taken verbatim from the utility's CCR violations section. EPA defines four broad violation categories: Maximum Contaminant Level (MCL), Treatment Technique (TT), Monitoring & Reporting (M&R), and Public Notification (PN).
-
monitoring2024-04-07
FAILURE TO CONSULT, GWR
-
reporting2021-10-06
PUBLIC NOTICE RULE NOT LINKED VIOLATION
Violations record from COSTILLA MDWCA Consumer Confidence Report.
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Costilla Mdwca (EPA ID: NM3505929) — request the latest Consumer Confidence Report or ask about specific contaminants.