01The verdict: is Duey Quinonez water safe?
Duey Quinonez's drinking water has significant quality concerns based on EPA testing data. With a grade of B (79.3/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 5,708 residents using groundwater (wells).
Copper is over its legal limit
Measured at 1.40 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 1.0 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 ↓Duey Quinonez's drinking water received a grade of B (79.3 out of 100), indicating good water quality. The city's 1 water system serves approximately 5,708 residents using groundwater.
Lead levels were measured at 1.0 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 105 violations on record, including 41 health-based violations. 11 remain unresolved.
Duey Quinonez ranks #13 out of 101 cities in Puerto Rico for water quality, placing it above average in the state. Duey Quinonez 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.
02What's in Duey Quinonez's water
Every contaminant flagged in Duey Quinonez, 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. | 1.0 | 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. | 1.40 | 1.3 | mg/L | Inorganic | Over Limit |
03Duey Quinonez'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 105 violations on record, including 41 health-based violations. 11 remain unresolved.
8 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 9 ppb since 1992. Latest reading: 1 ppb (2018) — 7% of the action level. Sampled at higher-risk homes (90th percentile).
1.4mg/L(1992)
One sampling round on record — 108% of the 1.3mg/L EPA action level. Sampled at higher-risk homes (90th percentile).
04Where Duey Quinonez's water comes from
Duey Quinonez'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.
1 system
1 water system, operated under local government ownership.
5,708 people
Residents served across Duey Quinonez'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 5,708 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| DUEY | PR0003553 | 5,708 | Groundwater |
Water bodies near Duey Quinonez
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05How Duey Quinonez compares
Scores for nearby Puerto Rico cities on one line, with the average marked.
dashed line = Puerto Rico average (39/100)
Duey Quinonez scores 79.3/100 — above the Puerto Rico average of 39/100. It outscores 10 of 10 nearby cities.
38.5 / 100FToa Alta, PR
38.5 / 100FMayaguez, PR
42.1 / 100FPonce, PR
34.9 / 100FAguadilla, PR
38.3 / 100FRincon, PR
38.3 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
06What to do at home
Steps matched to what testing actually found in Duey Quinonez's water — not generic advice.
Filter drinking & cooking water
NSF-certified water filter. 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 Duey Quinonez 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 Duey Quinonez, PR tap water safe to drink?
Duey Quinonez's water quality earned a grade of B (79.3/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #13 out of 101 cities tested in Puerto Rico.
What contaminants are in Duey Quinonez's water?
Lead was measured at 1.0 ppb (90th percentile). 105 violations are on record.
How is Duey Quinonez'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 Duey Quinonez?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Duey Quinonez's water come from?
Duey Quinonez's water is sourced from Groundwater. The city has 1 water system serving approximately 5,708 residents.
What health violations has Duey Quinonez's water system had?
Duey Quinonez has 41 health-based violations on record. The most recent violation was recorded in January 2019. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 11 violations remain unresolved.
Is Duey Quinonez's groundwater at risk of contamination?
Duey Quinonez 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 105 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 Duey Quinonez's water compare to other cities?
Duey Quinonez ranks #13 out of 101 cities in Puerto Rico (better than 87% of state cities) and #8204 out of 15382 cities nationally (47th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.