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Hawaii County, Hawaii

SDWIS compliance plate

Sheet HI001 · Hawaii County 39 sys · 811 viol · #437/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-TOP · BELOW-PEER · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 74.4% flagged
  • HEALTH-HIGH 73.4% health
  • RANK-TOP #437/3254
  • BELOW-PEER 2.6 pp cleaner
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 97%
  • SYS-SMALL 39 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Maui County (+ 2.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Hawaii County ranks #437 of 3,254 counties by people served, and #3 of 4 counties in Hawaii. See methodology · corpus placement.

Hawaii County standing, lower-flagged corpus third

Flagged-system rate 74.4% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 73.4% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #437 of 3,254 · #3 of 4 in Hawaii.

Flagged-rate neighbourhood around Hawaii County

Lowest/highest poles plus in-state counties nearest Hawaii County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Hawaii · this county · lowest Honolulu · near 74.4% 76.9% 82.5% 94.7%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Hilo 39,477 170 Clean
North Kona 29,581 8 Clean
Waikoloa 12,100 14 Clean
South Kohala 9,612 283 Clean
South Kona 6,512 12 Clean
Olaa-Mountain View 6,467 0 Clean
North Kohala 4,933 5 Clean
Haina 4,563 0 Clean
Hawaii Volcanoes Nat.park 4,201 11 Clean
Hawaiian Beaches 3,546 19 Clean
Waiohinu-Naalehu 2,948 0 -
Papaikou 2,203 4 -
Kaupulehu 1,945 42 -
Lalamilo 1,895 3 -
Pahoa 1,885 11 -
Pepeekeo 1,450 2 -
Hawaiian Shores 1,360 1 -
Pahala 1,226 90 -
Laupahoehoe-Kapehu 1,169 8 -
Hawaiian Ocean View Estates 1,000 6 -
Kohala Ranch Water Co. 850 11 Clean
Paauilo 716 0 -
Honomu 645 0 -
Kukuihaele 483 33 -
Napuu Water Inc. 468 0 -
Hakalau-Wailea 402 4 -
Kalapana 275 11 -
Ookala (Dws) 264 15 -
Kona Water Service Company 260 0 -
Niulii 254 13 -
Keopu Water Association 250 2 -
Kilauea Military Camp 220 9 -
Punalu'u 200 15 -
Kawaihae Unit #1 193 3 -
Ninole 151 3 -
Waiki'i Ranch 102 0 -
New Moon Foundation 80 0 -
Wood Valley 75 0 -
Pepeekeo Water Association 60 3 -

Compare beyond Hawaii

Lower-flagged peers for Hawaii County

Cross-state counties nearest Hawaii County on flagged-system share (74.4%) and cumulative violation count (811). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.