Buyers ask me about water in Washington County more often than they ask about schools, and it is a fair question in a desert that keeps adding people. The answer starts with a fact that surprises almost everyone who moves here: every drop of culinary water in this county comes out of one watershed. There is no second river and no imported supply. The Washington County Water Conservancy District puts countywide delivery at roughly 50,000 acre feet of potable water a year, all of it from the Virgin River and the ground underneath it. What that means for you has less to do with taps running dry than with what it costs to connect a new house, and what a city can require from a builder before it will sign a plat.
One watershed, and the district says it is close to fully developed
The Virgin River is a tributary of the Colorado, and the river plus its connected groundwater is the entire supply for St. George, Washington City, Hurricane, Ivins, Santa Clara and the smaller towns around them. On its own Sources page (wcwcd.gov), the Washington County Water Conservancy District says its existing facilities yield about 30,000 acre feet a year on average and that this source "is reaching its full development capacity." That sentence explains everything downstream of it: the impact fees, the landscape ordinances, the reuse projects, the metering deadlines. Here is what the county stores, from the district's published reservoir list:
| Reservoir | Capacity (acre feet) | Completed |
|---|---|---|
| Sand Hollow | 51,360 | 2002 |
| Quail Creek | 40,325 | 1984 |
| Gunlock | 10,884 | 1970 |
| Kolob | 5,586 | 1956 |
| Chief Toquer | 3,640 | Under construction |
| Ivins | 778 | 1918 |
Source: Washington County Water Conservancy District, published reservoir list, verified September 24, 2026.
The reservoirs are only half the storage. Sand Hollow sits on a natural Navajo sandstone aquifer the district describes as having underground storage capacity "in excess of 300,000 acre feet," and reservoir water seeps into that rock and is pulled back out through wells. Buried water does not evaporate the way an open reservoir does in a place that regularly hits 105 degrees, so that aquifer is the county's real drought buffer and it holds more than every surface reservoir here combined.
The Lake Powell Pipeline is out of the ten-year plan
For twenty years the answer to "what happens when the Virgin River runs out" was the Lake Powell Pipeline, a second source piped in from the Colorado. Here is the district's current language, from the impact fee plan its board adopted on December 1, 2025:
Due to factors outside of the control of the District, the project is now projected to occur outside the 10-year planning window of this plan and has therefore been excluded from the analysis but remains a part of the District's long-term planning.
Both halves of that matter. The pipeline is out of the ten-year capital plan and out of the math that sets impact fees, and it still sits in long-term planning. No first-party source I can find calls it cancelled, and I am not going to be the one who does. What changed is practical: nobody at the district is counting on that water to serve the subdivisions being platted right now.
What replaces it is smaller and closer. The Regional Reuse Purification System is the centerpiece, projected to produce more than 24,000 acre feet a year by 2042, which the district says is enough to serve more than 40,000 homes, with more than $250 million in funding secured and full build-out put at about 20 to 30 years. Chief Toquer Reservoir, 3,640 acre feet inside an approximately $94 million Ash Creek Project, is under construction in Toquerville now, which matters if you are shopping the Hurricane Valley side of the county (area page). Those are plans rather than delivered water.
How water gates a new subdivision here
This is the part that touches your transaction. Under Utah Code 10-20-803 (full text), subsection (3)(a), a municipality shall approve a plat if it conforms to the city's ordinances "and has been approved by the culinary water authority, the sanitary sewer authority, and the local health department." No water signature, no plat. That is the hard stop, and it is why a parcel can sit undeveloped for years while the owner waits on a water commitment. Note the section number: Utah renumbered its municipal land use code effective November 6, 2025, so anything you read citing 10-9a is using dead numbering.
Utah then added a second gate. Utah Code 10-20-912 (full text), "Exactions for water rights," was enacted by Chapter 166 of the 2026 General Session and took effect May 6, 2026. It requires a city to base any water exaction on the culinary water authority's own calculations, and to apply "lower exactions for developments with lower equivalent residential connections as demonstrated by at least five years of usage data for like land uses within the municipality." It also bars a city from imposing a water exaction at all if it has no written plan, and beginning January 1, 2028 that plan is mandatory. A city can still make a builder bring water to the table, but it has to show its arithmetic now, and a water-efficient project is entitled to a smaller ask.
Then there is cash. The district charges a regional water supply impact fee due when a building permit is secured. The schedule published on the district's website (fee page) shows $13,500 for a residential three-quarter inch or five-eighths inch meter. The impact fee analysis the board adopted on December 1, 2025 calculates $17,266 for the same size connection, labeled a water efficient user at 0.59 acre feet. The fee page carries no effective date and the December minutes record none, so I cannot tell you from published sources which number is in force today. Get it in writing from the district before you budget a build. Cities in the Regional Water Supply Agreement, covering St. George, Washington, Hurricane, Ivins, Santa Clara, La Verkin, Toquerville and Virgin, also agreed to "collect district impact fees that increase based on irrigated area." Bigger lawn, bigger check. If you are comparing new construction in St. George (current new-build listings), ask each builder whether that fee is inside the base price or added at permit, because the answer is not consistent.
Three rules then follow the finished house. Utah Code 10-20-619 (full text), amended effective May 6, 2026, ends the mandatory grass park strip statewide. Utah Code 73-10-34 requires a meter on every secondary water connection by January 1, 2030, so neighborhoods on secondary irrigation are headed for use-based billing. And St. George city code 10-23-1D16 prohibits landscape watering with treated water from 10:00 A.M. to 8:00 P.M., June 1 through September 1.
None of this says the county is about to run dry. It says water here is a cost and a compliance item rather than an open question, and it is priced into a new build more heavily than most buyers expect. For current inventory and pricing, the St. George market summary (updated monthly) carries the numbers.
Frequently Asked Questions
Is Washington County, Utah going to run out of water?
No published first-party source gives a date when Washington County runs out of water. The Washington County Water Conservancy District does say its Virgin River watershed source "is reaching its full development capacity," and it has a 20-year plan to add 46,615 acre feet of supply at a cost of more than $1 billion through 2042, built mainly from reuse, conservation and new local projects. The practical effect on a homeowner is higher connection costs and tighter landscaping rules, not an empty tap.
Is the Lake Powell Pipeline still happening?
The Lake Powell Pipeline has been excluded from the Washington County Water Conservancy District's ten-year planning window. In the impact fee plan its board adopted on December 1, 2025, the district wrote that the project "is now projected to occur outside the 10-year planning window of this plan and has therefore been excluded from the analysis but remains a part of the District's long-term planning." The district has not called it cancelled, and it is not being counted on for near-term growth.
Do I have to pay a water impact fee to build a house in Washington County, Utah?
Yes. The Washington County Water Conservancy District charges a regional water supply impact fee due when a building permit is secured. The schedule published on the district's website shows $13,500 for a residential three-quarter inch or five-eighths inch meter, while the impact fee analysis the board adopted on December 1, 2025 calculates $17,266 for the same connection. Neither carries a published effective date, so confirm the current amount with the district before you budget.
Can a Utah city require grass in my park strip?
No. Utah Code 10-20-619, as amended effective May 6, 2026, states that a municipality "may not require a property owner to install or keep in place lawn or turf in an area with a width less than eight feet," and separately bars a city from prohibiting water wise landscaping on private property. Homeowner association landscaping rules fall under a different statute, so check the declaration for your community.
Thinking about building or buying here?
If you are weighing a new build against resale, or working out what a lot really costs once water connection fees are counted, call or text me at 435-200-5508 and I will walk you through the numbers for the city you are looking at. You can also reach me through the contact form on this site (open it here), or start with the current listings on the St. George homes for sale page (see them here). I have sold real estate in St. George, Utah for thirteen years.