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Sierra County, NM Water Quality

Water quality data for 5 public water systems serving Sierra County, New Mexico — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 5 water systems · 6 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Sierra County Earns a C

Sierra County: 6 communities across 5 water systems. 66.7% have no open violations.

  • Median lead where detected: 1.20 ppb
  • 5 communities with a lead detection, 1 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 3 with significant inspection deficiencies
  • 66.7% of communities have no open violations
1.2 ppb
Median Lead Level
County-wide, 90th percentile
5
Water Systems
Active CWS & NTNCWS
66%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
⚠ Needs Attention
County Lead Level — Median 1.2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.2 ppb — 8% of the federal action level
Systems by Lead Level
Under 5 ppb
5
No Data
1

All Cities in Sierra County

Truth or Consequences 0.86 ppb F
Elephant Butte Not detected B
Williamsburg 0.86 ppb F
Arrey 1.80 ppb B
Hillsboro 2.70 ppb B
Hot Springs Landing 1.20 ppb B
Showing 6 cities
No active violations Active violations

About Sierra County Drinking Water

Sierra County is served by 5 water systems covering 6 communities. 67% have no open violations.

Of the communities reporting lead results, 5 recorded a detection, with a median of 1.20 ppb — 8% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 6 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 3 of them.

Frequently Asked Questions

Is Sierra County tap water safe to drink?▼
67% of communities have no open violation. 1 of 6 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Sierra County?▼
Among communities with a detection the median is 1.20 ppb, 8% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Sierra County?▼
5 community water systems serve 6 communities here.
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