Cottonwood Terrace, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 5.1 ppb (monitoring period 2021-2023). 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.
Cottonwood Terrace at a glance
Cottonwood Terrace serves about 213 people through 243 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lincoln County, Arizona. EPA system ID: NE3121429; phone on file: 385-787-0920. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 4.23 ppb from 0.87 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Cottonwood Terrace is 5.1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 5.1 ppb |
| 2022 | 0.87 ppb |
| 2017 | 0.61 ppb |
| 2017 | 0 (not detected) |
How Cottonwood Terrace compares
Of the 730 Arizona systems with a lead result, the median latest reading is 0 ppb; 9 are over 15 ppb right now and 58 have gone over at some point. Cottonwood Terrace's 5.1 ppb sits at the 90th percentile in Arizona and the 91st nationally (higher means more lead).
What to do in your house
Test your own tap with a certified lab first-draw sample; Gilbert, AZ 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 Cottonwood Terrace 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. The action level is dropping - the 10 ppb rule from 2027.