Tonto Hills, AZ · PWSID AZ0407076
Tonto Hills Dwid lead service lines
49 lines still unidentified
Tonto Hills Dwid reported no confirmed lead service lines, but 49 of 144 lines (34%) are still listed as "lead status unknown." Until a line is identified, treat it as possibly lead.
0% of Tonto Hills Dwid's service lines are lead or galvanized requiring replacement. That's lower than the Arizona average (0.1%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 34%
- Non-lead 66%
Total service lines reported: 144. Reported all required service line types. Population served: 350; 150 connections.
Lead test results
Tonto Hills Dwid's most recent 90th-percentile lead result (Jan 2025–Jun 2025) was not detected, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 0 in 2025 Q1 to 0 in 2026 Q3: no change. Lines of unknown material went from 49 to 49, no change.
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists 3 Lead and Copper Rule violations since 2015 for Tonto Hills Dwid. Health-based violations are treatment failures, such as corrosion control or public education; the rest are missed monitoring or reporting.
| Began | Violation | Status |
|---|---|---|
| Jul 2024 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
| Jul 2023 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
| Jan 2020 | Lead consumer notice not delivered or reported | Returned to compliance |
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Tonto Hills Dwid's main water source is purchased surface water. It buys treated water from City of Scottsdale. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Tonto Hills Dwid is responsible for its own service line inventory and replacement program.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Tonto Hills Dwid whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in Maricopa County
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| City of Phoenix | 506 | 227,517 |
| City of Mesa | 74 | 22,430 |
| Epcor - Sun City | 30 | 0 |
| Arizona Water Co - White Tanks | 9 | 1,641 |
| City of Tolleson | 6 | 270 |
| City of Buckeye | 1 | 499 |
| Town of Wickenburg | 7 | 2,399 |
| Country Club Acres Water INC | 5 | 0 |
Check another water system
Questions
Does Tonto Hills Dwid have lead pipes?
It hasn't confirmed any, but 49 of its 144 service lines are still of unknown material, so lead has not been ruled out.
How do I check if my home's service line is lead?
Look up your address on Tonto Hills Dwid's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will Tonto Hills Dwid replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has Tonto Hills Dwid had lead violations?
EPA's data shows 3 Lead and Copper Rule violations since 2015 for Tonto Hills Dwid.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "Tonto Hills Dwid lead service lines," https://leadpipemap.com/az/tonto-hills-dwid/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.