How Wastewater Capacity Limits Dripping Springs New Construction

A master plan for a new community in Dripping Springs might be sized at 3,393 LUEs, the city's unit for sizing sewer connections. As of this fall, the approved interim wastewater plan covers 250 of them. That gap explains why phase releases come in small batches and why builders talk about "the next section" more than the full build-out. It can also mean that the company handling your sewer at closing is not the one handling it a few years later. Across Dripping Springs, sewer capacity sets the pace of new construction more than land or buyer demand does.

The plant at the center of the bottleneck

Most of this traces back to one facility. The city's South Regional Wastewater Reclamation Facility has a treatment capacity of about 162,500 gallons per day. Community Impact reported in August 2026 that the plant had been near capacity for several months and could not take most new large connections.

The planned expansion would raise capacity to 822,500 gallons per day. It was delayed for years: the city applied for a discharge permit in 2015 and received it in 2019, a lawsuit followed, and the Texas Supreme Court ruled in favor of the TCEQ and the city in 2025. Deputy City Administrator Shawn Cox described the practical limit to Community Impact:

"It hasn't stopped developments from being able to tie in. It's just we're not going to tie in a large subdivision to it because it can't handle that."

Developers who can't connect a large subdivision to the city plant have two main options. They can build their own temporary treatment plants, or they can use pump-and-haul, where wastewater goes into a storage tank that is emptied on a schedule and trucked to another facility for treatment. Community Impact counted more than 3,800 lots or units in ongoing and upcoming developments that rely on these alternative systems.

The schedule keeps moving

The plant expansion is the event that would let these communities grow past their interim limits, so its timing matters. In August, Community Impact reported the city's plan: issue a notice to proceed to the winning bidder in December 2026, begin Phase 1 construction in 2027, and finish Phase 1 in two and a half to three years.

Monthly staff reports from Utilities Director Gray Lahrman to the Utility Commission show that timeline slipping:

• May 2026 report: council approval of the bid package expected July 21, 2026, with the award process starting August 1.
• July 2026 report: council presentation of the bid package set for September 1, with a December notice to proceed.
• August 2026 report: the bid package pushed to council in October, with the bid awarded by January.

The September report, posted for the commission's October 15, 2026 meeting, still targets a January award. It says the facility will add 399,000 gallons of treatment after the first phase of construction. The reports print that date as "January 2026." Those reports are dated September and October 2026, so the target reads as January 2027, though the reports don't print that year. A January award would land a month or more past the December notice to proceed Community Impact described. Add the city's own two-and-a-half to three-year build estimate, and Phase 1 capacity looks unlikely before 2029 at the earliest.

Collection lines are moving faster than the plant. The city awarded the South Collector contract to Santa Clara Construction in July. The September report says South Collector construction begins in October 2026 and West Interceptor Segment 2 is scheduled to finish in early November 2026. Both projects carry wastewater, but neither adds treatment capacity.

What each community has to work with right now

The September 2026 staff report lists each pending development's total size in LUEs along with its current interim arrangement. Comparing the two numbers shows how much of each plan can actually be served today.

At Anarene, the approved interim capacity covers about 7 percent of the planned community. At Village Grove it's about 13 percent until the on-site plant is built. Tri Point is the clearest small-scale example. The August report says that development can use 12 connections under pump-and-haul and all 18 once the plant expands. That leaves six homes waiting on a plant that has no construction contract yet.

The interim systems are also meant to change over time. City staff described Anarene's planned treatment plant as one that "converts to TLAP at certain LUE set threshold," meaning it moves to a land-application permit once the community reaches a set size. At Carter Ranch, the report says that once the city plant has capacity, "the City will take over the infrastructure and operation of the wastewater system." For someone buying in one of these communities, the sewer arrangement at closing may be a temporary one.

Established communities show what waiting looks like

Communities with longer histories show how this plays out once homes are occupied. Heritage, which is in the city's collection system, had 480 LUEs as of April 2026, with 286 holding certificates of occupancy and 194 remaining. The January 2026 report said Heritage Phase 4 homes were "on hold until discharge plant is operation." Later reports didn't update that line, so it should be read as the status in early 2026. At that point, a phase of an established community was waiting on the same plant the new communities depend on.

Big Sky Ranch went a different route, building capacity in steps on its own land-application system. City records list its treatment facility and drip field among the facilities managed by city utilities. In April 2026, staff reported that interim TLAP Phase 3 had been accepted at 54,300 gallons per day.

Headwaters works on a separate model. Headwaters Municipal Utility District is the retail wastewater provider within its boundaries, and the district's bill covers both water and wastewater. Buyers comparing Headwaters with a community inside the city system are comparing two different billing and governance setups. Our guide to MUD and PID fees in Dripping Springs explains how district charges show up.

Then there's New Growth, which Community Impact reported is waiting to proceed until the South Regional plant has more capacity. For that project, the timeline in the staff reports is effectively the construction schedule.

The bill side of the same constraint

City wastewater customers are also paying more to run the current system. In May 2026, the council raised the residential base fee from $28.88 to $43.32 and the usage rate from $4.05 to $5.67 per 1,000 gallons. The new rates started appearing on September 2026 bills. At an average of 6,578 gallons a month, a typical residential bill goes from $55.52 to $80.62. Utilities Director Gray Lahrman told Community Impact that the main driver is growth in the customer base and the operating demands that come with it. Those rates apply to city customers. Communities served by a MUD or by a third-party operator during an interim phase may have different rates.

Questions that surface the arrangement before contract

Builders' sales materials rarely lead with wastewater. These questions bring it up early, while you still have options:

1. Which system serves this specific lot today: the city collection system, an on-site treatment plant, a TLAP field, pump-and-haul, or a utility district?
2. Who operates the system and who sends the bill? Is that expected to change, and what event triggers the change?
3. How many connections does the interim arrangement allow, and how many have already been used?
4. Do later phases depend on the South Regional expansion? If they do, what happens to the amenity timeline and to the empty lots near yours?
5. Does the purchase paperwork describe the wastewater provider, and where can that be checked against city or district records?

Most of these can be checked against the city's monthly utility reports, which are public. Our guide to building in Dripping Springs covers the other site-level questions that come up with new construction there.

FAQ

Is the city adding any new sewer connections at all? Yes, but only some. Cox told Community Impact the city has been able to accept some new connections, while Lahrman said most new large residential connections would not be added except in special circumstances such as an existing agreement.

Will the expanded plant discharge into Onion Creek? The permit allows discharge, but Lahrman told Community Impact the city intends to use it only in emergencies and will store treated wastewater that can't be used for irrigation.

Is the Driftwood area part of this? Parts of it are. The Hays Free Press reported in July 2026 that the city and Cuncashca LLC reinstated and amended a wastewater facilities agreement for the Driftwood Golf and Ranch subdivision. The September staff report also lists a Driftwood treated-effluent pond under construction, with substantial completion set for March 3, 2027.

If you're comparing new-construction communities around Dripping Springs, Sarah McAloon can help you check each lot's wastewater arrangement, phase timing and builder terms against the city's own records before you sign. Schedule Your Personal Consultation to go over the communities on your list.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.