Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Hawaii Water Quality Reports
Water quality scores for 15 cities in Hawaii
Waimalu
15,132 residents
Hilo
45,703 residents
East Honolulu
50,922 residents
Mililani Town
27,629 residents
Wahiawa
17,821 residents
Ewa Gentry
24,866 residents
Kahului
26,337 residents
Mililani Mauka
21,039 residents
Waipahu
43,485 residents
Kailua
38,635 residents
Kihei
21,423 residents
Pearl City
47,698 residents
Honolulu
345,064 residents
Makakilo
18,248 residents
Kaneohe
34,597 residents
About Hawaii Water Quality
This state's water quality reflects local geographic conditions, industrial activities, and water infrastructure. Water quality can vary significantly between communities, with some areas enjoying excellent tap water while others face contamination challenges requiring treatment.
Based on our analysis of 15 cities in Hawaii, the average water quality score is 81/100. 1 cities have water quality scores below 70, indicating potential concerns that residents should be aware of. The highest-rated city is Kaneohe with a score of 67/100, while Waimalu has the most room for improvement at 92/100.
Water Sources in Hawaii
Water sources typically include a combination of surface water (rivers, lakes, reservoirs) and groundwater. The specific sources serving your community depend on local geography and infrastructure. Check your local water utility's Consumer Confidence Report for details about your water source.
Common Water Contaminants in Hawaii
These contaminants have been detected in various Hawaii water systems
Hawaii Water Regulations
State environmental and health agencies oversee drinking water quality in compliance with federal EPA standards. Public water systems are required to test regularly and report results to residents through annual Consumer Confidence Reports.
Health Considerations
Water quality concerns vary by location. Common issues include lead from older plumbing, agricultural runoff in rural areas, and industrial contamination near manufacturing sites. Check your local water quality report and consider testing if you have specific concerns.
Recommendations for Hawaii Residents
Review your annual Consumer Confidence Report to understand local water quality. Consider having your water tested if you use a private well or have concerns about your plumbing. Water filters certified to remove specific contaminants can address most common water quality issues.
Frequently Asked Questions About Hawaii Water Quality
Is Hawaii's tap water safe to drink?
Most Hawaii cities have tap water that meets EPA safety standards. With an average score of 81/100 across 15 cities we analyzed, Hawaii generally has good water quality. However, water quality varies by location, so check your specific city's report.
What are the main water quality concerns in Hawaii?
The most common water quality concerns in Hawaii include disinfection byproducts (chlorination), lead (older infrastructure), nitrates (agricultural areas). These contaminants can come from natural sources, industrial activities, or aging infrastructure. Review your city's specific report to see which contaminants affect your area.
Should I use a water filter in Hawaii?
Whether you need a water filter depends on your specific location and health concerns. With 1 cities in Hawaii showing elevated contaminant levels, residents in those areas may benefit from filtration. Look for filters certified by NSF/ANSI to remove the specific contaminants found in your area.
Where can I find my Hawaii water quality report?
Public water systems in Hawaii are required to provide annual Consumer Confidence Reports (CCRs) to residents. You can usually find your report on your water utility's website, request it by phone, or access it through the EPA's database. Our city-level reports above summarize key information from these official sources.