Cienega Water Company Inc, AZ
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Cienega Water Company Inc at a glance
Cienega Water Company Inc serves about 108 people through 54 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in La Paz County, Arizona. EPA system ID: AZ0415002; phone on file: 928-667-2590. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cienega Water Company Inc is 4.6 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 4.6 ppb |
| 2020 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0.6 ppb |
How Cienega Water Company Inc 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. Cienega Water Company Inc's reported as 0 (not detected) sits at the 14th percentile in Arizona and the 10th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in La Paz County
18 other systems share La Paz County; 5 of them have a higher latest lead result than Cienega Water Company Inc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Quartzsite Town Of | 2,761 | 9.9 ppb |
| Epcor - Lakeside | 1,775 | 0 (not detected) |
| Epcor - Moovalya Keys | 1,298 | 6.2 ppb |
| Ehrenberg Improvement District | 989 | 1.5 ppb |
| Epcor - Holiday Harbor | 559 | 0 (not detected) |
| Epcor - Marina Village | 528 | 0 (not detected) |
| 88 Shades Rv Park | 488 | 0 (not detected) |
| Hillcrest Water Company | 459 | 6 ppb |
| Q Mountain Vista Mhp | 440 | 2.9 ppb |
| Epcor - Parker Dam | 429 | 0 (not detected) |
Next steps for Parker, AZ
Look up your address in Cienega Water Company Inc's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cienega Water Company Inc 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.