Coamo Arriba, PR
Lead detected, under the action levels
Latest 90th-percentile lead: 3 ppb (monitoring period 2023-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Coamo Arriba at a glance
Coamo Arriba serves about 420 people through 157 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Coamo Municipio County, PR. EPA system ID: PR0422084; phone on file: 787-825-7374. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
The highest 90th-percentile result EPA holds for Coamo Arriba is 3 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 3 ppb |
Where this result ranks
Of the 111 PR systems with a lead result, the median latest reading is 5 ppb; 10 are over 15 ppb right now and 16 have gone over at some point. Coamo Arriba's 3 ppb sits at the 26th percentile in PR and the 82nd nationally (higher means more lead).
Neighbouring systems
3 other systems share Coamo Municipio County; 0 of them have a higher latest lead result than Coamo Arriba. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Comunidad Monteria | 360 | - |
| Asociacion Residente San Diego | 270 | 3 ppb |
| La Cuesta | 90 | - |
What to do in your house
Test your own tap with a certified lab first-draw sample; Coamo, PR may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Coamo Arriba whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.