Living in Topaz Estates

Topaz Estates sits inside Diamond Valley, an unincorporated part of Washington County (outside any city). It is built almost entirely on large residential lots, and the county's own general plan for the area marks it for homes on large lots. Bureau of Land Management (BLM) and State of Utah land surrounds it on most sides. That is not a marketing description. It is the zoning map. This is acreage country by design, not by accident.

The streets here have a gemstone theme: Sapphire Trail, Jade Court, Onyx Court, Garnet Court, Opal Court, Amethyst Drive, and Emerald Drive. They all feed off Diamond Valley Drive and Topaz Road. It is a small, self-contained community, not a subdivision that blends into the next one.

The trade for that space is distance. Diamond Valley Drive and SR-18 are the only paved way in and out. So every trip to a grocery store, a hospital, or a big-box store means a drive of some length. If you want elbow room and are willing to plan your errands, that trade works. If you want to walk to a coffee shop, it will not.

Topaz Estates is platted under Washington County's RE-40 zone, which sets a minimum lot size of roughly one acre. That single fact shapes everything else about the community. It is not a subdivision built by one builder, with matching setbacks (how far a building must sit from the lot lines) and a shared look. It is a plat of large parcels that owners have built on one by one over time.

The county has no municipal water or sewer line running to Diamond Valley. So every property here runs on a private well and an on-site septic system (a buried tank and drain field that handle waste water). That is standard for the whole Diamond Valley area, not unique to Topaz Estates. But it is the detail that changes how you own the property day to day. In a denser subdivision, water and sewer are shared systems, and they would be a line on the seller disclosures. Here, the well's flow rate and the septic system's age and capacity are checks on the property itself.

I am not going to publish a price range or a median for Topaz Estates. Acreage plats like this one sell in small numbers, sometimes a handful of closings in a year. Any figure I quote today is likely stale by the time you read it. Ask me and I will pull recent sales for the specific lot size and build you are comparing.

Topaz Estates falls inside the attendance boundary (the area a school serves) for Diamond Valley Elementary (grades K-5). It is a Washington County School District school at 1411 W Diamond Valley Drive, in the same community as the subdivision.

The district's boundary maps put Topaz Estates in the Dixie schools after Diamond Valley: Dixie Intermediate, Dixie Middle and Dixie High. Check the middle and high school assignment for any specific address with Washington County School District before you rely on it.

Diamond Valley is unincorporated Washington County, not a St. George city subdivision, and there is no municipal water or sewer main running to Topaz Estates. That is exactly why the county's own general plan marks this whole area for homes on large lots rather than a standard growth zone.

That means every property runs on a private well and an on-site septic system. A well's flow rate and static water level (how far down the water sits) tell you whether it can support the household you are planning. A septic system's age, tank size, and drain-field condition tell you what you are inheriting. Neither shows up on a listing photo, and I would not skip checking either one.

It also means county services, not city ones, apply here. Road maintenance, fire response, and any future utility extension are Washington County matters, not St. George City matters, even though the mailing address says St. George. I would check exactly what that means for a specific parcel with the county before writing an offer.