PRASA – Mayaguez water quality
Mayagüez, PR · serves 152,342 people (57,057 connections) · Surface water · Local government · EPA ID PR0003283
Data: U.S. EPA · How we read the data · How we check it
Summary
No limits exceeded in the data EPA has, but the record is incomplete: no lead results since 2015.
- PFAS
- Not detectedNone of 29 PFAS found above EPA's reporting limits in 26 samples (2023–2025).
- Lead
- Out of dateEPA's national database has no lead results for this system since 2015 (then 6 ppb, 90th percentile). Systems this size normally test every one to three years, so this most likely means newer results were not reported to EPA, not that testing stopped. Ask the utility for its latest results.
- Violations
- Resolved13 health-based violations since 2016, most recently Sep 2022. 3 required an urgent public notice within 24 hours (the kind behind boil-water notices), most recently Sep 2022. What to do if you get a notice.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Got a boil-water or do-not-drink notice? What each notice means and what to do.
- Want to reduce what was found? Filters for these results.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read PRASA – Mayaguez's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (787) 620-2277. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 12 entry points tested Mar 2025 to Dec 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 0 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 26 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 6 ppb lead (Jul 2015 – Dec 2015). No results since 2015
This is the newest lead result in EPA's national database. Utilities report lead results to their state, and states pass them to EPA. Gaps like this usually mean the newer results did not reach EPA's database, not that the utility stopped testing. Results this old may not reflect the water today. Ask the utility or your state drinking water program for the latest lead monitoring.
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jul 2015 – Dec 2015 | 6 ppb |
| Jul 2012 – Dec 2012 | 6 ppb |
| Jul 2009 – Dec 2009 | 7 ppb |
Earlier results (9)
| Jun 2006 – Sep 2006 | 3 ppb |
| Jul 2003 – Dec 2003 | 1.8 ppb |
| Jul 2002 – Dec 2002 | 1.3 ppb |
| Jul 2001 – Dec 2001 | 3.3 ppb |
| Jul 2000 – Dec 2000 | 3 ppb |
| Jan 2000 – Jun 2000 | 9 ppb |
| Jan 1993 – Jun 1993 | 7 ppb |
| Jul 1992 – Dec 1992 | 5 ppb |
| Jan 1992 – Jun 1992 | 10 ppb |
Copper 90th percentile: 50 ppm (Dec 2015), action level 1,300 ppb.
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
| When | What happened |
|---|---|
| Jun 2017 – Sep 2022 2 times | The water was cloudier than allowed at least once. Cloudiness can shield germs from disinfection. Urgent public notice required What that means EPA record: Interim Enhanced Surface Water Treatment Rule · Single Turbidity Exceed (Enhanced SWTR) (limit ) Resolved |
| Jan 2016 – Oct 2018 6 times | The running annual average for TTHM was above the legal limit. EPA record: TTHM · Maximum Contaminant Level Violation, Average · measured 0.081 mg/l (limit 0.080 mg/L) Resolved |
| May 2018 | A required treatment report was not submitted. EPA record: Long Term 2 Enhanced Surface Water Treatment Rule · Failure Submit Treatment Requirement Rpt (limit ) Resolved |
| Jun 2017 | The water was too cloudy too often in a month. Cloudiness can shield germs from disinfection. Urgent public notice required What that means EPA record: Interim Enhanced Surface Water Treatment Rule · Monthly Turbidity Exceed (Enhanced SWTR) (limit ) Resolved |
| Jan 2016 – Jul 2016 3 times | The running annual average for Total Haloacetic Acids (HAA5) was above the legal limit. EPA record: Total Haloacetic Acids (HAA5) · Maximum Contaminant Level Violation, Average · measured 0.068 mg/l (limit 0.060 mg/L) Resolved |
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 176 ppb | 300 ppb |
| Chlorate | 706 ppb | 210 ppb |
| Vanadium | 19.2 ppb | 21 ppb |
| Chromium-6 | 1.79 ppb | – |
| Strontium | 0.68 ppm | 1.5 ppm |
Where it serves
Mayagüez, Añasco
ZIP codes the system reported serving: 00680, 00726
Nearby utilities
- PRASA – Aguadilla Aguadilla · 16 mi · PFAS above limit
- PRASA – Arecibo Urbano Arecibo · 32 mi
- PRASA – Ponce Urbano Ponce · 37 mi · PFAS above limit
- PRASA – Aruz Juana Díaz · 43 mi · PFAS above limit
- PRASA – Experimental Juana Díaz · 43 mi · PFAS above limit
- PRASA – Jacaguas Juana Díaz · 43 mi · PFAS above limit
Questions
Is PRASA – Mayaguez water safe to drink?
PRASA – Mayaguez had 13 health-based violations since 2016, all since resolved. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does PRASA – Mayaguez water have PFAS?
EPA tested PRASA – Mayaguez for 29 PFAS between Mar 2025 and Dec 2025 and none were detected above the reporting limits (about 2 to 20 ppt depending on the chemical).
What is the lead level in PRASA – Mayaguez water?
The most recent 90th-percentile lead result for PRASA – Mayaguez is 6 ppb, for the period ending Dec 2015, which is more than five years old. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for PR0003283: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID PR0003283).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask PRASA – Mayaguez at (787) 620-2277, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.