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EPA SDWIS City OverviewWater Testing & Safety Guide

Captain Cook, HI Water Quality Testing & Safety Report

EPA compliance records, water testing guidelines, and hardness metrics for all 1 ZIP code in Captain Cook, Hawaii

Sahajul HaqueData aggregated & verified by Sahajul Haque from federal SDWIS & ECHO filings
Quick EPA Verified Summary

Is Tap Water Safe to Drink in Captain Cook, HI?

Yes, tap water in Captain Cook, HI is safe to drink under EPA Safe Drinking Water Act standards. The city earns an average EPA Safety Grade of B (73/100) across 1 ZIP codes with 0 health violations and hard (160 mg/L / 9.4 GPG) water. Certified testing is recommended for older plumbing or private wells.

Average Score

73/100

Health Violations

0

Water Hardness

Hard

160 mg/L (9.4 GPG)

High Lead Risk

0

of 1 ZIP codes

B

About Tap Water in Captain Cook, HI

Drinking water in Captain Cook, HI receives an average water quality grade of B (score: 73/100) across its 1 ZIP code. Safe Drinking Water Act compliance monitoring is managed by local utilities including South Kona.

Water Quality Testing in Captain Cook, HI

Tap Water & Well Water Testing Recommendations

Testing your drinking water in Captain Cook confirms whether contaminants like lead, nitrates, bacteria, and PFAS are entering your home. While municipal utilities test water before distribution, private plumbing and private well systems require homeowner testing.

Tap Water Testing Checklist

  • 1.Identify your plumbing age: Homes built before 1986 in Captain Cook may have lead solder or lead service lines.
  • 2.Request your utility's latest Consumer Confidence Report (CCR) for annual municipal baseline data.
  • 3.Use an EPA-certified laboratory or state-certified test kit for precision lead and PFAS detection (standard DIY strips cannot reliably measure trace heavy metals).
  • 4.Collect a "first draw" sample: Test water that has sat motionless in pipes for at least 6 hours to check for plumbing corrosion.

Private Well Water Testing Checklist

  • •Private wells in HI are not monitored by the EPA or Hawaii Department of Health — testing is 100% the homeowner's responsibility.
  • •Annual Test: Screen for Total Coliform Bacteria, E. coli, Nitrates/Nitrites, and pH every spring.
  • •Comprehensive Test (Every 3-5 Years): Test for heavy metals (Lead, Arsenic, Uranium), Volatile Organic Compounds (VOCs), and Hardness.
  • •Post-Disruption Testing: Immediately test well water following heavy floods, local construction, agricultural runoff, or sudden taste/odor changes.

Critical Water Testing Parameters for Captain Cook Residents

ParameterHealth ReasonEPA Limit / Standard
Lead (Pb)Plumbing corrosion; dangerous neurotoxin for children15 ppb (Action Level) / 0 ppb Goal
Total Coliform & E. ColiBacterial contamination from sewage or surface runoff0 mg/L (Zero Tolerance)
Nitrates / NitritesFertilizer and septic tank seepage; causes blue baby syndrome10 mg/L (MCL)
Water Hardness (Ca & Mg)Affects appliance lifespan, scale buildup, and skin hydrationHard (>120 mg/L)
PFAS ("Forever Chemicals")Industrial non-stick chemicals linked to metabolic and immune issues4.0 ppt (EPA 2024 Rule)
State Regulatory Oversight: Environmental standards and certified water lab registries in HI are maintained by the Hawaii Department of Health.

Water Quality by ZIP Code — Captain Cook, HI

Showing 1 of 1 monitored ZIP code in Captain Cook

B
96704

Captain Cook, HI

Score: 73/100✓ Clean Record

All Captain Cook, HI ZIP Code Reports (1 Total)

96704

Nearby Cities Water Quality & Testing in Hawaii

Compare tap water safety, EPA test scores, and water hardness across neighboring cities in Hawaii:

Aiea, HI1 ZIP code
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Anahola, HI1 ZIP code
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Eleele, HI1 ZIP code
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Ewa Beach, HI1 ZIP code
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Fort Shafter, HI1 ZIP code
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Haiku, HI1 ZIP code
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Hakalau, HI1 ZIP code
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Frequently Asked Questions — Captain Cook Water Quality & Testing

Is tap water safe to drink in Captain Cook, HI?+
Yes — tap water in Captain Cook meets federal EPA standards and earns a B grade. It is generally safe for healthy adults. As always, running your tap for 30 seconds before use and using a filter adds extra protection for vulnerable populations.
How do I test water quality in Captain Cook, HI?+
To test water quality in Captain Cook, you can order an EPA-compliant drinking water test kit or submit samples to a state-certified environmental testing laboratory in HI. Testing is especially recommended for homes built before 1986 (to check for lead in plumbing) and for properties with private well systems.
Should I test private well water in Captain Cook?+
Yes. Unlike municipal tap water, private wells in Captain Cook, HI are not monitored or regulated by the EPA or local utilities. Private well owners are responsible for testing their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
How hard is the tap water in Captain Cook?+
Tap water in Captain Cook is classified as Hard with an estimated average hardness of 160 mg/L (9.4 GPG). Homeowners may want to consider a water softener to prevent scale buildup in appliances.
What is the water quality score for Captain Cook?+
The average water quality score across 1 ZIP code in Captain Cook, HI is 73/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.
Does Captain Cook have lead in its tap water?+
Lead risk ratings in Captain Cook are relatively low based on EPA monitoring data. However, lead in home plumbing is a separate concern — if your home was built before 1986, individual tap testing is recommended.
Where does Captain Cook's tap water come from?+
Tap water in Captain Cook, HI primarily comes from ground water. Groundwater systems pump water from underground aquifers, which is naturally filtered through soil and rock but can still contain naturally occurring contaminants.

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