Is Duey Quinonez, PR Tap Water Safe to Drink?
Graded B — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
79.3/100
waterverge.com Duey Quinonez, PR — Water Quality Report
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.
What to know about Duey Quinonez's water
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.
Water quality score
See methodology →Is Duey Quinonez, PR water safe to drink?
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).
Recent water quality updates for Duey Quinonez
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Duey Quinonez's water quality assessment. Grade: B (79.3/100).
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Contaminants: Consumer Confidence Rule.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Duey Quinonez's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Duey Quinonez's water system has 105 total violations on record, including 41 health-based violations. 11 remain unresolved.
Where does Duey Quinonez's water come from?
Duey Quinonez's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 5,708 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Lago Garzas Nr Adjuntas (lake), Rio Grande De Arecibo Nr Adjuntas (river), Rio Guayanilla (river), Lago Lucchetti (lake), Rio Yauco (river).
What Duey Quinonez residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Duey Quinonez's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Recommended water filters
Based on contaminants detected in Duey Quinonez's water supply, we recommend the following filter types.
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 |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 1.400 mg/L (1992)
EPA action level: 1.3 mg/L
See how Duey Quinonez compares by contaminant
Explore where Duey Quinonez ranks among all Puerto Rico cities for specific contaminants.
Water source & infrastructure
Where Duey Quinonez's water comes from
Duey Quinonez's drinking water is drawn from underground aquifers through wells.
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.
Water bodies near Duey Quinonez
Duey Quinonez is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Duey Quinonez
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DUEY | PR0003553 | 5,708 | GW |
How Duey Quinonez compares
Full Puerto Rico rankings →Duey Quinonez's score of 79.3/100 is above the average of 38/100 among major Puerto Rico cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Puerto Rico rankings →About Duey Quinonez, PR
Wikipedia →Yauco is a town and municipality in southern Puerto Rico. Although the downtown is inland, the municipality stretches to a southern coast facing the Caribbean Sea. Yauco is located south of Maricao, Lares and Adjuntas; east of Sabana Grande and Guánica; and west of Guayanilla. The municipality consists of 20 barrios and Yauco Pueblo. It is both a principal town of the Yauco Metropolitan Statistical Area and the Ponce-Yauco-Coamo Combined Statistical Area.
Learn more about your water
Guides and resources related to Duey Quinonez's water quality findings.
Explore water quality across San German Municipio
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 #8300 out of 15744 cities nationally (47th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.