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La Paz County, AZ Water Quality

Water quality data for 11 public water systems serving La Paz County, Arizona — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 11 water systems · 12 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

La Paz County Earns a B

La Paz County: 12 communities across 11 water systems. 83.3% have no open violations.

  • Median lead where detected: 1.90 ppb
  • 4 communities with a lead detection, 8 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 6 with significant inspection deficiencies
  • 83.3% of communities have no open violations
1.9 ppb
Median Lead Level
County-wide, 90th percentile
11
Water Systems
Active CWS & NTNCWS
83%
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
  • Quartzsite
    Not detected
    No federal limits exceeded on record
    B
  • La Paz Valley
    1.20 ppb
    No federal limits exceeded on record
    B
  • Ehrenberg
    1.50 ppb
    1 significant inspection deficiency
    B
  • Cienega Springs
    Not detected
    10 health-based violations since 2015
    B
  • Wenden
    Not detected
    18 health-based violations since 2015
    B
⚠ Needs Attention
  • Salome
    Not detected
    2 violations currently open
    D
  • Vicksburg
    Not detected
    2 violations currently open
    D
  • Parker
    2.30 ppb
    3 significant inspection deficiencies
    C
  • Bluewater
    2.30 ppb
    3 significant inspection deficiencies
    C
  • Bouse
    Not detected
    1 significant inspection deficiency
    C
County Lead Level — Median 1.9 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.9 ppb — 12.7% of the federal action level
Systems by Lead Level
Under 5 ppb
4
No Data
8

All Cities in La Paz County

Parker 2.30 ppb C
Quartzsite Not detected B
Cienega Springs Not detected B
Ehrenberg 1.50 ppb B
Salome Not detected D
Wenden Not detected B
Bouse Not detected C
La Paz Valley 1.20 ppb B
Parker Strip Not detected B
Bluewater 2.30 ppb C
Cibola Not detected C
Vicksburg Not detected D
Showing 12 cities
No active violations Active violations

About La Paz County Drinking Water

La Paz County is served by 11 water systems covering 12 communities. 83% have no open violations.

Of the communities reporting lead results, 4 recorded a detection, with a median of 1.90 ppb — 13% of the federal action level. 8 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 6 of them.

Frequently Asked Questions

Is La Paz County tap water safe to drink?▼
83% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in La Paz County?▼
Among communities with a detection the median is 1.90 ppb, 13% of the 15 ppb action level. 8 reported none detected and 0 reported no result.
How many water systems serve La Paz County?▼
11 community water systems serve 12 communities here.
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