From Johnson Utilities to EPCOR: San Tan Valley's Complicated Water History

Talk to enough San Tan Valley homeowners and a pattern emerges: a lot of people here do not drink their tap water, and many of them cannot immediately tell you why. The reason is usually that they arrived after the fact and absorbed a neighborhood consensus that the water is not to be trusted.

That consensus did not come from nowhere. It is worth understanding, because it is the difference between an informed decision about filtration and an anxious one.

For years, water and wastewater service across much of this area was provided by Johnson Utilities, a privately held utility. Over that period the utility drew sustained scrutiny from regulators and from residents over operational and water quality concerns, and it became a persistent local controversy rather than a passing one.

In 2018 the Arizona Corporation Commission took the unusual step of appointing an interim manager to run the system — EPCOR — following that regulatory process. EPCOR subsequently took over the system, and the area is now served by EPCOR's San Tan district.

For residents who lived through it, that history is not abstract. It shaped how an entire community thinks about its tap.

EPCOR operates the San Tan district today and the water meets drinking water standards. Like every regulated utility, it publishes annual water quality reporting, and reading yours is a reasonable thing to do — it is the primary document about what is actually in your water.

What has not changed, and will not, is hardness. The water here runs 15 to 18 grains per gallon, well into the very hard classification. That is a function of Pinal County's groundwater geology rather than of who operates the system, and no change of utility affects it. See what San Tan Valley's water hardness means.

The conversation gets muddled because two distinct concerns get treated as one:

• Is the water safe? A regulatory and public health question, answered by testing and reporting.
• Is the water hard? An equipment and comfort question, answered by a number — and here that number is high.

A water softener addresses the second one and only the second one. It removes calcium and magnesium so your water heater does not fill with sediment and your fixtures do not scale. It does not filter contaminants, it does not improve taste, and it adds a small amount of sodium.

A reverse osmosis system addresses drinking water specifically — dissolved solids, chlorine byproducts and the mineral taste. Most homeowners here end up wanting both, and that is a perfectly sensible configuration regardless of what you believe about the utility.

This is the part we care about most, because we see the aftermath. Lingering distrust makes San Tan Valley a productive market for aggressive water treatment sales, and some of what gets sold here is priced far above what the equipment is worth.

An honest assessment takes about twenty minutes: a hardness reading with an actual number, a look at your existing softener loop, a grain capacity calculation based on your household size and use, and two or three real options with real prices. No theatrics required.

1. 1Read your annual water quality report. It is the actual document about your actual water, and it takes ten minutes.
2. 2Test your hardness. A strip confirms you are in the very hard range. If you are on a private well — common on the fringes near Chandler Heights — get a laboratory test instead.
3. 3Install a softener for the house. It protects your water heater, fixtures, appliances and glass. At this hardness the equipment savings are real.
4. 4Install RO for drinking water if you want better-tasting water or simply prefer the peace of mind. It is an inexpensive addition when installed alongside a softener.
5. 5Be skeptical of anyone selling on fear rather than on a hardness number and a capacity calculation.

Wanting filtration on your drinking water is a reasonable choice, and we install a lot of it. We just think you should make that decision with the facts in front of you rather than because of something a salesperson did with a glass of water on your kitchen counter.