States › New Mexico › San Juan County

San Juan County, NM Water Quality

Water quality data for 15 public water systems serving San Juan County, New Mexico — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 15 water systems · 24 cities
⚠️
Caution Advised — Some Systems Need Attention

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

C

San Juan County Earns a C

San Juan County: 24 communities across 15 water systems. 91.7% have no open violations.

  • Median lead where detected: 0.83 ppb
  • 17 communities with a lead detection, 7 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 23 with significant inspection deficiencies
  • 91.7% of communities have no open violations
0.83 ppb
Median Lead Level
County-wide, 90th percentile
15
Water Systems
Active CWS & NTNCWS
91%
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
  • South River
    5.00 ppb
    Lead at 5.00 ppb, above a third of the action level
    B
  • La Plata
    0.60 ppb
    2 significant inspection deficiencies
    B
  • Aztec
    0.70 ppb
    4 significant inspection deficiencies
    B
  • Center Point
    Not detected
    4 significant inspection deficiencies
    B
  • Cedar Hill
    Not detected
    4 significant inspection deficiencies
    B
⚠ Needs Attention
  • Lake Valley
    Not detected
    Copper above the 1,300 ppb action level
    F
  • Middle Mesa
    2.00 ppb
    8 violations currently open
    F
  • Flora Vista
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Spencerville
    Not detected
    Copper above the 1,300 ppb action level
    D
  • La Boca
    163.00 ppb
    Lead above the 15 ppb action level
    D
County Lead Level — Median 0.83 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 0.83 ppb — 5.5% of the federal action level
Systems by Lead Level
Under 5 ppb
14
5 – 10 ppb
1
10 – 15 ppb
2
No Data
7

All Cities in San Juan County

Farmington 4.00 ppb C
Bloomfield 2.00 ppb C
Aztec 0.70 ppb B
Crouch Mesa Not detected C
Center Point Not detected B
Flora Vista Not detected D
West Hammond 0.83 ppb C
La Plata 0.60 ppb B
Lee Acres 0.83 ppb C
Waterflow 0.50 ppb C
South River 5.00 ppb B
Cedar Hill Not detected B
Spencerville Not detected D
Fruitland 0.50 ppb C
Kirtland 0.50 ppb C
Angustura 2.00 ppb C
Blanco 0.69 ppb C
North Light Plant Not detected B
Turley 0.69 ppb C
Navajo Dam 10.00 ppb C
Middle Mesa 2.00 ppb F
La Boca 163.00 ppb D
Lake Valley Not detected F
Totah Vista 4.00 ppb C
Showing 24 cities
No active violations Active violations

About San Juan County Drinking Water

San Juan County is served by 15 water systems covering 24 communities. 92% have no open violations.

Of the communities reporting lead results, 17 recorded a detection, with a median of 0.83 ppb — 6% of the federal action level. 7 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 23 of them.

Frequently Asked Questions

Is San Juan County tap water safe to drink?▼
92% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in San Juan County?▼
Among communities with a detection the median is 0.83 ppb, 6% of the 15 ppb action level. 7 reported none detected and 0 reported no result.
How many water systems serve San Juan County?▼
15 community water systems serve 24 communities here.
← Back to New Mexico water quality overview