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Hawaii County, HI Water Quality

Water quality data for 21 public water systems serving Hawaii County, Hawaii — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 21 water systems · 41 cities
✅
Excellent — All Systems Performing Well

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

A

Hawaii County Earns a A

Hawaii County: 41 communities across 21 water systems. 100.0% have no open violations.

  • Median lead where detected: 8.99 ppb
  • 3 communities with a lead detection, 38 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 15 with significant inspection deficiencies
  • 100.0% of communities have no open violations
8.99 ppb
Median Lead Level
County-wide, 90th percentile
21
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
  • Hilo
    Not detected
    No federal limits exceeded on record
    A
  • Waikoloa Village
    Not detected
    No federal limits exceeded on record
    A
  • Captain Cook
    Not detected
    No federal limits exceeded on record
    A
  • Honokaa
    Not detected
    No federal limits exceeded on record
    B
  • Kealakekua
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Honomu
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Honalo
    Not detected
    3 significant inspection deficiencies
    B
  • Kailua
    Not detected
    3 significant inspection deficiencies
    B
  • Kaiminani
    Not detected
    3 significant inspection deficiencies
    B
  • Kahaluu-Keauhou
    Not detected
    3 significant inspection deficiencies
    B
County Lead Level — Median 8.99 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 8.99 ppb — 59.9% of the federal action level
Systems by Lead Level
5 – 10 ppb
3
No Data
38

All Cities in Hawaii County

Hilo Not detected A
Kailua Not detected B
Kaiminani Not detected B
Waimea Not detected A
Waikoloa Village Not detected A
Kahaluu-Keauhou Not detected B
Captain Cook Not detected A
Honokaa Not detected B
Kurtistown Not detected A
Hawi Not detected A
Hawaiian Paradise Park Not detected A
Kealakekua Not detected A
Pepeekeo Not detected B
Holualoa Not detected B
Kapaau Not detected A
Hawaiian Beaches Not detected B
Pahala Not detected B
Hawaiian Ocean View Not detected B
Mountain View Not detected A
Wainaku Not detected A
Papaikou Not detected B
Honaunau-Napoopoo Not detected A
Pahoa Not detected B
Mauna Loa Estates 8.99 ppb A
Waikoloa Beach Resort Not detected A
Paauilo Not detected B
Laupahoehoe Not detected B
Honomu Not detected B
Paukaa Not detected B
Volcano 8.99 ppb A
Puako Not detected B
Black Sands Not detected B
Seaview Not detected B
Kukuihaele Not detected B
Volcano Golf Course 8.99 ppb A
Keaau Not detected A
Orchidlands Estates Not detected A
Kaloko Not detected B
Kalapana Not detected B
Naalehu Not detected B
Honalo Not detected B
Showing 41 cities
No active violations Active violations

About Hawaii County Drinking Water

Hawaii County is served by 21 water systems covering 41 communities. No community here has an open violation on record.

Of the communities reporting lead results, 3 recorded a detection, with a median of 8.99 ppb — 60% of the federal action level. 38 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 15 of them.

Frequently Asked Questions

Is Hawaii County tap water safe to drink?▼
No community in Hawaii County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Hawaii County?▼
Among communities with a detection the median is 8.99 ppb, 60% of the 15 ppb action level. 38 reported none detected and 0 reported no result.
How many water systems serve Hawaii County?▼
21 community water systems serve 41 communities here.
← Back to Hawaii water quality overview