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Counties → Hawaii

Maui County, Hawaii

SDWIS compliance plate

Sheet HI009 · Maui County 39 sys · 2,585 viol · #381/3254

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

  • VIOL-SEVERE 76.9% flagged
  • HEALTH-MID 42.6% health
  • RANK-TOP #381/3254
  • ABOVE-PEER +2.6 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 85%
  • SYS-SMALL 39 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Hawaii County ( -2.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Maui County ranks #381 of 3,254 counties by people served, and #2 of 4 counties in Hawaii. See methodology · corpus placement.

Maui County standing, lower-flagged corpus third

Flagged-system rate 76.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 42.6% 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 #381 of 3,254 · #2 of 4 in Hawaii.

Flagged-rate neighbourhood around Maui County

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

0% 20% 40% 60% 80% 100% Hawaii · lowest Maui · this county Honolulu · near Kauai · highest 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
Wailuku 74,511 59 Clean
Makawao 29,868 304 Clean
Lahaina 20,065 243 Clean
Kaanapali 8,000 18 Clean
Upper Kula 7,686 256 Clean
Kapalua 4,200 30 Clean
Kaunakakai 3,702 76 Clean
Lower Kula 3,522 145 Clean
Lanai City 3,200 153 -
Hoolehua 2,400 46 -
Kipahulu 2,000 3 -
Hana 1,284 139 -
Haleakala National Park 1,200 14 -
Ualapue 1,119 60 -
Maunaloa-Kaluakoi 1,000 140 -
Hoku'ula Water System 1,000 0 -
Hana Water Systems - South 816 31 -
Mahanalua Nui Subdivison 606 0 -
Kawela Plantation 553 1 -
Kualapuu 500 100 -
Kalae 360 16 -
Keanae 270 43 Clean
Hana Water Systems - North 160 12 -
Kahakuloa Water Co. 150 3 -
Kalaupapa Nhp 110 59 -
Nahiku 107 65 -
Olowalu 100 155 -
Maunaolu Plantation 100 0 -
Kailua 90 88 -
Consolidated Baseyards 90 24 -
Kipu 80 11 -
Kula Nani 80 0 -
Maui Business Park Phase II 63 0 -
West Kuiaha Meadows 60 0 -
Honokohau 42 285 -
Baldwin Ranch Estates 32 0 -
Maui Highlands 26 0 -
Haiku Town Water Association, Inc. 20 6 -
Pulehunui Water Association 10 0 -

Compare beyond Hawaii

Lower-flagged peers for Maui County

Cross-state counties nearest Maui County on flagged-system share (76.9%) and cumulative violation count (2,585). 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.