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Pima County, AZ Water Quality

Water quality data for 26 public water systems serving Pima County, Arizona — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 26 water systems · 36 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Pima County Earns a A

Pima County: 36 communities across 26 water systems. 100.0% have no open violations.

  • Median lead where detected: 0.65 ppb
  • 22 communities with a lead detection, 14 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 100.0% of communities have no open violations
0.65 ppb
Median Lead Level
County-wide, 90th percentile
26
Water Systems
Active CWS & NTNCWS
100%
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
  • Elephant Head
    Not detected
    No federal limits exceeded on record
    B
  • Tucson
    0.65 ppb
    No federal limits exceeded on record
    A
  • Casas Adobes
    0.57 ppb
    No federal limits exceeded on record
    A
  • Catalina Foothills
    0.65 ppb
    No federal limits exceeded on record
    A
  • Oro Valley
    1.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Flowing Wells
    Not detected
    PFAS above the limit at 1 of 6 sampling points
    C
  • Why
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Pisinemo
    0.50 ppb
    3 significant inspection deficiencies
    C
  • Summerhaven
    5.70 ppb
    1 significant inspection deficiency
    B
  • J-Six Ranchettes
    Not detected
    1 significant inspection deficiency
    B
County Lead Level — Median 0.65 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 0.65 ppb — 4.3% of the federal action level
Systems by Lead Level
Under 5 ppb
18
5 – 10 ppb
3
10 – 15 ppb
1
No Data
14

All Cities in Pima County

Tucson 0.65 ppb A
Casas Adobes 0.57 ppb A
Catalina Foothills 0.65 ppb A
Oro Valley 1.00 ppb A
Drexel Heights 0.65 ppb A
Marana 0.65 ppb A
Tanque Verde 0.65 ppb A
Sahuarita Not detected A
Green Valley Not detected A
Vail Not detected A
Tucson Estates 0.65 ppb A
Tucson Mountains 0.65 ppb A
Corona de Tucson 0.78 ppb A
Valencia West 0.65 ppb A
Flowing Wells Not detected C
Picture Rocks Not detected A
South Tucson 0.65 ppb A
Catalina Not detected A
Rincon Valley 8.10 ppb B
Avra Valley Not detected B
Sells 0.50 ppb A
Summit 7.00 ppb B
Three Points 0.65 ppb A
Ajo Not detected B
Arivaca Junction Not detected B
Nelson Not detected B
Arivaca Not detected B
Kleindale 0.65 ppb A
Why Not detected C
Rillito 12.00 ppb B
Pisinemo 0.50 ppb C
Summerhaven 5.70 ppb B
Ali Chukson 0.50 ppb B
Topawa 0.50 ppb B
J-Six Ranchettes Not detected B
Elephant Head Not detected B
Showing 36 cities
No active violations Active violations

About Pima County Drinking Water

Pima County is served by 26 water systems covering 36 communities. No community here has an open violation on record.

Of the communities reporting lead results, 22 recorded a detection, with a median of 0.65 ppb — 4% of the federal action level. 14 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 36 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 4 of them.

Frequently Asked Questions

Is Pima County tap water safe to drink?▼
No community in Pima County has an open violation on record. 1 of 36 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Pima County?▼
Among communities with a detection the median is 0.65 ppb, 4% of the 15 ppb action level. 14 reported none detected and 0 reported no result.
How many water systems serve Pima County?▼
26 community water systems serve 36 communities here.
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