01The verdict: is Pepeekeo water safe?
Pepeekeo's tap water meets most EPA standards but has areas that warrant attention. With a grade of B+ (82.4/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 1,450 residents using groundwater (wells).
Copper is over its legal limit
Measured at 1.55 mg/L against the EPA Action Level of 1.3 mg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓Check back after the next refresh
EPA data updates on a rolling basis; we fold in new samples and violations every month.
Get alerts ↓Pepeekeo's drinking water received a grade of B+ (82.4 out of 100), indicating good water quality. The city's 2 water systems serve approximately 1,450 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 2 violations on record, including 1 health-based violation. 2 remain unresolved.
Pepeekeo ranks #60 out of 64 cities in Hawaii for water quality, placing it among the lowest-rated in the state. Pepeekeo relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff. As a small community water system, Pepeekeo may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Pepeekeo's water
Every contaminant flagged in Pepeekeo, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Over Limit — EPA Action Level: 1.3 mg/L
Exceeds the EPA action level. Copper leaches from household plumbing — flush taps for 30 seconds before drinking, and consider a certified filter.Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.55 | 1.3 | mg/L | Inorganic | Over Limit |
Cities ranked by 90th-percentile lead PF PFAS in Hawaii
Cities ranked by compounds detected Cu Copper in Hawaii
Cities ranked by 90th-percentile copper
03Pepeekeo's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 2 violations on record, including 1 health-based violation. 2 remain unresolved.
All ten of the last ten years were clean — no EPA violations recorded for Pepeekeo.
▼ Down 0 ppb since 2004. Latest reading: 0 ppb (2023) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
▼ Down 0.95 mg/L since 1993. The latest reading (1.6 mg/L, 2004) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Pepeekeo's water comes from
Pepeekeo's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
2 systems
2 water systems, operated under local government ownership.
1,450 people
Residents served across Pepeekeo's service area.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals. Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds. The system is operated by local government ownership and serves approximately 1,450 people through 2 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| PEPEEKEO | HI0000106 | 1,450 | Groundwater |
| PEPEEKEO WATER ASSOCIATION | HI0000167 | 60 | Purchased Groundwater |
Water bodies near Pepeekeo
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Pepeekeo's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
2 facilities within 10 miles reported 0 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
06How Pepeekeo compares
Scores for nearby Hawaii cities on one line, with the average marked.
dashed line = Hawaii average (92/100)
Pepeekeo scores 82.4/100 — below the Hawaii average of 92/100. Full Hawaii rankings →
91.1 / 100AWaipahu-Ewa-Waianae, HI
92.8 / 100AWailuku, HI
91.4 / 100APearl Harbor, HI
94.8 / 100AMililani Bws, HI
97.5 / 100ASchofield Barracks, HI
91.8 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Pepeekeo's water — not generic advice.
Filter drinking & cooking water
Basic carbon filter for extra protection. Copper exceeds the EPA action level of 1.3 mg/L
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Pepeekeo alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Pepeekeo, HI tap water safe to drink?
Pepeekeo's water quality earned a grade of B+ (82.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #60 out of 64 cities tested in Hawaii.
What contaminants are in Pepeekeo's water?
Lead was measured at 0.0 ppb (90th percentile). 2 violations are on record.
How is Pepeekeo's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Pepeekeo?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Pepeekeo's water come from?
Pepeekeo's water is sourced from Groundwater. The city has 2 water systems serving approximately 1,450 residents.
What health violations has Pepeekeo's water system had?
Pepeekeo has 1 health-based violation on record. The most recent violation was recorded in January 2010. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Pepeekeo's groundwater at risk of contamination?
Pepeekeo uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 2 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Pepeekeo's water compare to other cities?
Pepeekeo ranks #60 out of 64 cities in Hawaii (better than 6% of state cities) and #6914 out of 15382 cities nationally (55th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.