States › Arizona › Yuma County

Yuma County, AZ Water Quality

Water quality data for 14 public water systems serving Yuma County, Arizona — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 16 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

Yuma County Earns a B

Yuma County: 16 communities across 14 water systems. 87.5% have no open violations.

  • Median lead where detected: 1.10 ppb
  • 9 communities with a lead detection, 7 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 87.5% of communities have no open violations
1.1 ppb
Median Lead Level
County-wide, 90th percentile
14
Water Systems
Active CWS & NTNCWS
87%
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
  • Gadsden
    Not detected
    No federal limits exceeded on record
    B
  • Yuma Proving Ground
    1.10 ppb
    No federal limits exceeded on record
    B
  • Dateland
    Not detected
    2 health-based violations since 2015
    B
  • Wall Lane
    Not detected
    2 health-based violations since 2015
    B
  • Somerton
    1.00 ppb
    1 significant inspection deficiency
    A
⚠ Needs Attention
County Lead Level — Median 1.1 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.1 ppb — 7.3% of the federal action level
Systems by Lead Level
Under 5 ppb
9
No Data
7

All Cities in Yuma County

Yuma 1.10 ppb B
Fortuna Foothills Not detected C
San Luis 1.00 ppb D
Somerton 1.00 ppb A
Wellton 0.52 ppb C
Gadsden Not detected B
Avenue B and C 1.10 ppb B
Yuma Proving Ground 1.10 ppb B
El Prado Estates Not detected D
Drysdale Not detected B
Dateland Not detected B
Tacna 4.30 ppb B
Wall Lane Not detected B
Donovan Estates 1.10 ppb B
Padre Ranchitos 1.00 ppb B
Martinez Lake Not detected B
Showing 16 cities
No active violations Active violations

About Yuma County Drinking Water

Yuma County is served by 14 water systems covering 16 communities. 88% have no open violations.

Of the communities reporting lead results, 9 recorded a detection, with a median of 1.10 ppb — 7% 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 5 of them.

Frequently Asked Questions

Is Yuma County tap water safe to drink?▼
88% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Yuma County?▼
Among communities with a detection the median is 1.10 ppb, 7% of the 15 ppb action level. 7 reported none detected and 0 reported no result.
How many water systems serve Yuma County?▼
14 community water systems serve 16 communities here.
← Back to Arizona water quality overview