Sun City Water Company: EPCOR and Your Irrigation

Who is the water company in Sun City?

EPCOR Water Arizona supplies Sun City through its Sun City Water District. EPCOR's rates page says the district serves Sun City and the neighbouring town of Youngtown, and that the Arizona Corporation Commission reviews and approves its rates. Wastewater is billed through a separate EPCOR district.

The district is not a city department. Sun City is unincorporated, so the utility's tariff, filed with the Corporation Commission, does the job that a city water code does elsewhere. Sun City West, next door, has its own EPCOR district and its own tariff, so the district named on the bill is what decides which rules apply to a meter.

Where does Sun City's water come from?

Wells. EPCOR's 2025 water quality report says the district pumps groundwater from the West Salt River Valley sub-basin, an aquifer that the report places 150 to over 500 feet below the surface. The same report counts nearly 24,000 service connections across the district.

For irrigation, the useful line in that report is hardness: 7 to 11 grains per gallon, which the report's own scale places in the hard to very hard range, and EPCOR does not treat drinking water for hardness. That mineral load is why drip emitters and spray nozzles in Sun City need regular cleaning. The report describes the white crust on fixtures as mostly calcium carbonate, the same scale that narrows an emitter opening.

What does EPCOR handle that affects my irrigation?

Four things matter most. EPCOR's Sun City tariff sets backflow requirements for irrigation, defines drought curtailment stages, commits EPCOR to flag unusually high use, and lists conservation help such as audits and landscape advice.

• Backflow. Where EPCOR requires an assembly on irrigation service, the tariff names a lead free reduced pressure principle type, with test records due within 10 days and failures fixed within 14. EPCOR's cross connection page adds annual testing by a certified tester and lists crossconnection@epcor.com for questions. The backflow tariff guide walks through it.
• Drought stages. Stage 1 is normal; Stage 4 prohibits lawn, tree and shrub irrigation, including drip. The water restrictions guide explains each stage.
• High use. EPCOR tracks use, contacts customers when it looks excessive, and can send a field technician to verify consumption and run a leak inspection. The high water bill guide shows what to check first.
• Conservation help. A free audit kit, a homeowner landscape packet and on-site consultations on low water use landscaping, on request.

What help can I ask EPCOR for?

Ask for the audit kit, the landscape packet or a high-use review. EPCOR's conservation kits page lists what comes in the free audit kit, including a bag for timing flow at the meter and a gauge for drips, and it is requested by email to conservation@epcor.com with the account number.

The tariff's conservation sheets add more. New customers can ask for a free Homeowner Landscape Packet, and any customer can request an on-site consultation on low water use landscaping and efficient watering. EPCOR also runs the West Valley Xeriscape Demonstration Garden at 15626 N. Del Webb Blvd., listed on its education and outreach page, where low water use plants grow in a working landscape. None of these is a repair, but they are a documented, free first look.

Where does EPCOR's responsibility end?

At the meter. Everything on the property side, including the house supply, the irrigation mainline, valves, heads and drip lines, belongs to the owner. EPCOR's developer and engineering guide notes that, under the Uniform Plumbing Code, a structure above 80 psi needs a pressure reducing valve on the customer side of the meter.

That split matters when something goes wrong. A wet patch that grows between cycles, a valve that will not close or a broken lateral is a repair for the owner to arrange; irrigation leak detection in Sun City covers how those are traced. An assembly that fails its backflow test is the owner's to repair within the tariff's 14 days; see backflow preventer testing in Sun City.

How do I confirm EPCOR serves my address?

Read the bill. A Sun City mailing address alone does not settle which district or utility supplies a meter, and the tariffs differ between districts. If the bill names the Sun City Water District, the rules in this guide apply; if it names another district or utility, check that provider's rules before acting on any of them.

Next step in Sun City

Once you know EPCOR is the supplier, the irrigation side is yours to keep tight. Every local service, from leak tracing to backflow testing, is listed on the Sun City service area page.