Is San Juan, PR Tap Water Safe? Quality & Contaminants

What was found in San Juan's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
6:2 Fts	0.0490 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
8:2 Fts	0.0153 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
PFOA	0.0109 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
Pfba	0.0086 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
PFOS	0.0078 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
Pfda	0.0075 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: METROPOLITANO · 1,084,637 people · 2016	1/2	LCR
Pfpea	0.0040 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5
Pfhxa	0.0035 µg/L No EPA limit set Main supplier: METROPOLITANO · 1,084,637 people · 2025	1/2	UCMR-5

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving San Juan

Supplier	Population served
METROPOLITANO	1,084,637
SUPERACUEDUCTO	25

Frequently asked questions about San Juan tap water

Is San Juan tap water safe to drink?

EPA testing detected 9 contaminants in the water serving San Juan. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve San Juan?

2 public water suppliers report drinking-water monitoring for San Juan, PR to the EPA. Each is listed above with its population served.

What contaminants are in San Juan's water?

The contaminants EPA monitoring detected in San Juan include 6:2 Fts, 8:2 Fts, PFOA, Pfba, PFOS. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.