States › Hawaii › Maui County

Maui County, HI Water Quality

Water quality data for 13 public water systems serving Maui County, Hawaii — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 28 cities
✅
Excellent — All Systems Performing Well

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

A

Maui County Earns a A

Maui County: 28 communities across 13 water systems. 100.0% have no open violations.

  • Median lead where detected: 0.88 ppb
  • 15 communities with a lead detection, 13 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 9 with significant inspection deficiencies
  • 100.0% of communities have no open violations
0.88 ppb
Median Lead Level
County-wide, 90th percentile
13
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
  • Kahului
    Not detected
    No federal limits exceeded on record
    A
  • Kihei
    Not detected
    No federal limits exceeded on record
    A
  • Wailuku
    Not detected
    No federal limits exceeded on record
    A
  • Waihee-Waiehu
    Not detected
    No federal limits exceeded on record
    A
  • Wailea
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Keokea
    3.70 ppb
    Copper above the 1,300 ppb action level
    C
  • Olinda
    3.70 ppb
    Copper above the 1,300 ppb action level
    C
  • Kula
    1.70 ppb
    Copper above the 1,300 ppb action level
    B
  • Napili-Honokowai
    0.78 ppb
    4 significant inspection deficiencies
    B
  • Lahaina
    0.78 ppb
    4 significant inspection deficiencies
    B
County Lead Level — Median 0.88 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 0.88 ppb — 5.9% of the federal action level
Systems by Lead Level
Under 5 ppb
14
5 – 10 ppb
1
No Data
13

All Cities in Maui County

Kahului Not detected A
Kihei Not detected A
Wailuku Not detected A
Waihee-Waiehu Not detected A
Pukalani 0.88 ppb A
Haiku-Pauwela 0.88 ppb A
Makawao 0.88 ppb A
Napili-Honokowai 0.78 ppb B
Lahaina 0.78 ppb B
Wailea Not detected A
Kula 1.70 ppb B
Waikapu Not detected A
Lanai City Not detected B
Kaunakakai 0.77 ppb A
Paia Not detected A
Keokea 3.70 ppb C
Kaanapali Not detected A
Haliimaile 0.88 ppb A
Mahinahina 0.78 ppb B
Hana Not detected B
Olinda 3.70 ppb C
Launiupoko Not detected B
Ualapue 1.00 ppb B
Maalaea Not detected A
Kapalua 0.78 ppb B
Makena Not detected A
Kualapuu 1.00 ppb B
Maunaloa 9.35 ppb B
Showing 28 cities
No active violations Active violations

About Maui County Drinking Water

Maui County is served by 13 water systems covering 28 communities. No community here has an open violation on record.

Of the communities reporting lead results, 15 recorded a detection, with a median of 0.88 ppb — 6% of the federal action level. 13 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 9 of them.

Frequently Asked Questions

Is Maui County tap water safe to drink?▼
No community in Maui County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Maui County?▼
Among communities with a detection the median is 0.88 ppb, 6% of the 15 ppb action level. 13 reported none detected and 0 reported no result.
How many water systems serve Maui County?▼
13 community water systems serve 28 communities here.
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