# Repiping in South Austin and Southwest Austin: Reroute or Repipe After a Slab Leak > Repiping South and Southwest Austin: reroute or repipe after a slab leak in 1970s and 1980s houses, high pressure, and clay in 78745 vs limestone. URL: https://gracklerepipingaustin.com/service-areas/south-austin/ ## What starts a repipe in South Austin Ticket A Slab leak ### A hot line leaking under the slab A warm spot on the floor or a meter that runs with every tap closed. The local fix is usually to abandon the line in the slab and reroute it overhead. Ticket B Second leak ### Another slab leak a year or two after the first Each new leak raises the question of rerouting one more line or replacing the supply system through the attic at once. Ticket C Pressure ### Banging pipes and dripping relief valves Static pressure above 65 psi triggers Austin's regulator and expansion tank rule. The southwest ZIP codes lead the city in regulator permits. Ticket D Yard line ### A wet patch between the meter and the house 78745 has more water service line permits than any other Austin ZIP code. That line is the owner's from the meter to the house. ## Services in South Austin ### Slab leak reroutes A leaking water line under the slab is confirmed, capped and abandoned, then replaced with a new line run overhead through the attic and down the walls. Details → ### Whole-house repiping Every hot and cold supply line from the main shutoff to the fixtures replaced, permitted under Austin's plumbing code, pressure tested and patched. Details → ### PEX repiping A whole-house or partial repipe in PEX tubing, with the tubing type, fittings and layout chosen for the house and run to Austin's attic and pressure rules. Details → ### Water line replacement The buried yard line from the meter to the house replaced by trench or bore, with a new customer valve, a permit and a pressure test before backfill. Details → ### Copper repiping A whole-house or partial repipe in rigid copper tube, joined by soldering or press fittings and routed for the access a rigid pipe needs. Details → In much of South Austin and Southwest Austin, the repiping conversation starts after a slab leak, not before one. These four ZIP codes, 78745, 78748, 78749 and 78739, account for 36 of the City’s 149 water reroute permits from October 2021 to October 2026, tied with Northwest Austin for the most of any part of the city, and 78749 alone leads every Austin ZIP code with 13. The reader’s real question is whether to reroute the leaking line or replace the supply system. [Grackle Repiping Austin](https://gracklerepipingaustin.com/) offers and manages slab-leak reroutes and whole-house repiping across Westgate, Garrison Park, Sweetbriar, Western Oaks and Circle C Ranch. Licensed and insured plumbing contractors do the work, and a City-registered responsible master plumber pulls the permit. Pressure comes into almost every one of those decisions here, so it gets measured on the first visit. ## The reroute-or-repipe decision Austin’s plumbing permits describe the local fix plainly. A typical entry reads: “Abandon the leaking 3/4 hot water line in the foundation & reroute it overhead in the attic.” Of the 149 reroute permits citywide, 80 mention the attic, overhead or ceiling. Rather than break the slab to reach a leak, the leaking line is capped where it enters the floor and a new line is run through the attic and down a wall to the fixture it served. The table compares the two paths for a typical one-story slab house of the 1970s or 1980s. | | Reroute one line | Whole-house repipe | | --- | --- | --- | | What changes | The leaking line is capped and replaced overhead | Every hot and cold supply line is replaced, usually through the attic | | Typical Austin-area range | About $4,000 to $9,750, before leak detection | $4,500 to $15,000+; about $4,500 to $9,000 for PEX with typical access | | Pipe in the slab afterward | The other slab lines stay in service | Every slab line is capped and abandoned in place | | Best fit | Sound pipe with one isolated failure | Pinholes elsewhere, repeat leaks, or several lines through the same slab | Where the house is plumbed in copper and one hot line fails, the rest is often the same age and the same wall thickness. Homeowners report repeat slab leaks in the same house, and each reroute adds another set of openings. The [slab leak repair or reroute guide](https://gracklerepipingaustin.com/guide/slab-leak-repair-or-reroute/) and the [reroute cost guide](https://gracklerepipingaustin.com/guide/slab-leak-reroute-cost/) set out where the line between the two choices usually falls, and the [slab leak reroute page](https://gracklerepipingaustin.com/slab-leak-reroute/) covers the work itself. ## Clay in 78745, limestone in 78749 and 78739 The ground is different on either side of MoPac’s southern end, and it changes how a slab leak should be read. 78745, around Westgate, Cherry Creek and Garrison Park, has 42.6% of its homes built from 1970 to 1989 and a median year of 1984. At the repipe and reroute permit locations there, the federal soil survey maps Houston Black clay as the main soil, and 8 of 21 locations are rated high for shrink-swell. In dry spells Houston Black opens cracks as wide as four inches a foot below the surface, then closes them as it takes on water, so a slab on it rises and settles through the year, and pipe passing through the slab moves with it. 78745 also ranks third in Austin for permit descriptions that mention slabs, with 101. West of MoPac, 78749 and 78739 sit on Eckrant and Speck soils, shallow layers over limestone, and only 1 permit location in each rates high for shrink-swell. Their houses are newer too: 78749’s median year built is 1993, 78739’s is 2003, and 78748’s is 2004. Slab leaks still happen there, from pinholes, corrosion and pipe rubbing where it leaves the concrete, but heaving clay is a weak explanation. The [copper pinhole leak guide](https://gracklerepipingaustin.com/guide/copper-pinhole-leaks/) covers those causes. ## High pressure on the southwest side Regulator work concentrates here. Per 10,000 housing units, 78739 has the highest rate of City permits that mention a pressure reducing valve, 41.8, and 78749 is third citywide at 29.0, or 49 permits. Homeowners on the southwest side report static readings well above 100 psi. Austin Water’s polybutylene service replacement program also lists 78745, 78748 and 78749 among its ZIP codes and gives priority to lines where pressure exceeds 105 psi. Austin’s code draws the line at 65 psi of static pressure. Above it, a house must have a pressure regulator fitted with a strainer and adjusted to 65 psi or lower, followed by an expansion tank listed to NSF 61 (City amendment to UPC 608.2). High static pressure adds stress to every joint, valve and water heater connection in the house, so a reroute or repipe here includes a pressure reading at a hose bib and, where needed, a regulator and tank written into the estimate. The [pressure reducing valve guide](https://gracklerepipingaustin.com/guide/pressure-reducing-valve-austin/) explains how they work and how long they last. ## Attic runs in a production slab house An overhead route puts the new lines in the attic of a slab house, where summer heat and winter cold both reach them. Any water line outside the thermal envelope has to be wrapped to at least R-4 under the City’s local code (section 312.6.1), which means insulation no thinner than 5/8 inch. The National Weather Service records about 33 days a year below freezing at Austin-Bergstrom, in the low Onion Creek basin, against about 12 at Camp Mabry, so low-lying ground away from the urban core can see far more freezing nights than the central city. Attic lines are insulated and supported off the hot roof deck. The [guide to PEX in a Texas attic](https://gracklerepipingaustin.com/guide/pex-in-attic-texas/) covers the details. A [PEX repipe](https://gracklerepipingaustin.com/pex-repiping/) suits long overhead runs because it needs fewer fittings, and [copper repiping](https://gracklerepipingaustin.com/copper-repiping/) remains a sound choice where an owner prefers metal. ## The yard line stays yours 78745 has more water service and yard line permits than any other Austin ZIP code, 67 over the five-year window, with 78749 at 43 and 78748 at 37. The line from the meter to the house belongs to the owner. Austin Water’s polybutylene program replaces only the public side, from the main to the meter, so a new utility line does not mean a new yard line. Where a yard line leaks or the house needs a new main shutoff, the [water line replacement page](https://gracklerepipingaustin.com/water-line-replacement/) covers trenching, boring and the customer valve. ## What the first visit and the work look like After a slab leak, the first job is proving the leak is on a water supply line, since a drain leak calls for different work. The visit then records what the pipe is made of, puts a gauge on a hose bib for the static reading, checks how much crawl room the attic has and picks the walls where a line can drop. Separate estimate lines cover the City permit, the pressure test and the drywall patching, so two prices can be compared line by line. Through the job, water is restored every evening. City inspection follows a passed pressure test and comes before any wall is closed; whatever old pipe can be reached is removed, and the slab runs are sealed and left where they are. ## North of Ben White and down I-35 North of Ben White, [South Central Austin](https://gracklerepipingaustin.com/service-areas/south-central-austin/) has older, mixed housing and a pressure-zone project near Oltorf. [Northwest Austin](https://gracklerepipingaustin.com/service-areas/northwest-austin/) is the city’s other reroute hotspot, on limestone like 78749. South along I-35, [Kyle](https://gracklerepipingaustin.com/service-areas/kyle/) has its own permit office and hard groundwater. ## Neighborhoods and coverage - Westgate - Cherry Creek - Garrison Park - South Manchaca - Sweetbriar - Western Oaks - Circle C Ranch - Southpark Meadows ### Landmarks - Lady Bird Johnson Wildflower Center - Mary Moore Searight Metropolitan Park - Dick Nichols District Park - Veloway ### Routes - MoPac (Loop 1) - Brodie Lane - Slaughter Lane - William Cannon Drive - Manchaca Road - South First Street - Ben White Boulevard - State Highway 45 1. 1. Cedar Park 2. 2. East Austin 3. 3. Georgetown 4. 4. Kyle 5. 5. North Central Austin 6. 6. Northwest Austin 7. 7. Round Rock 8. 8. South Austin 9. 9. South Central Austin ## South Austin questions ### How much does a repipe or slab leak reroute cost in South Austin? A typical Austin-area range is about $4,000 to $9,750 for a slab leak reroute, before leak detection, and $4,500 to $15,000+ for a whole-house repipe, or about $4,500 to $9,000 for PEX with typical access. Long overhead runs, a second story and a regulator with an expansion tank push a job higher. ### After one slab leak, should I reroute just that line? Often a single reroute is the sensible first fix, especially when the rest of the pipe tests sound. The case for a whole-house repipe grows when the leak is in copper that has already pinholed elsewhere, when more lines run through the same slab, or when a second leak follows. Both options can be priced side by side. ### Why is water pressure so high in Circle C and southwest Austin? Pressure depends on the elevation of a house relative to the utility's pressure zone. Homeowners report readings well above 100 psi on parts of the southwest side, and Austin plumbing permits for regulators run highest in 78739 and 78749. A gauge on a hose bib gives the real number for one house. ### Austin Water replaced the polybutylene line to my meter. Is my yard line new too? No. Austin Water's polybutylene program replaces the public-side line from the main to the meter. The yard line from the meter to the house, and the piping inside, stay as they were and remain the owner's responsibility. ### Does a slab leak in 78745 mean the foundation is moving? Not necessarily. Many 78745 permit locations sit on Houston Black clay, which shrinks and swells, but slab leaks also come from corrosion, pinholes and pipe rubbing at the concrete. A plumber fixes the water line; whether the slab has moved is a question for a foundation professional. ## Related guides - Decision Guide [Should a slab leak be repaired or rerouted?](https://gracklerepipingaustin.com/guide/slab-leak-repair-or-reroute/)Three ways to fix a leaking water line under a slab, and the conditions that make each one the sensible choice: how many leaks, what the pipe is, what is on the floor and what the attic allows. - Cost Guide [How much does a slab leak reroute cost in Austin?](https://gracklerepipingaustin.com/guide/slab-leak-reroute-cost/)What it typically costs in the Austin area to abandon a leaking line under the slab and run a new one overhead, what the price covers and leaves out, and how it compares with breaking the slab or repiping the whole house. - Learn [Do I need a pressure reducing valve in Austin?](https://gracklerepipingaustin.com/guide/pressure-reducing-valve-austin/)Austin's plumbing code sets the line at 65 psi: above it, a house needs a pressure reducing valve with a strainer and an expansion tank after it. Here is how the rule works, how a valve fails, and how it fits into a repipe. - Learn [Can PEX run through an attic in Texas?](https://gracklerepipingaustin.com/guide/pex-in-attic-texas/)Why slab-home water lines end up in the attic, what Austin's code requires for them, and how routing, insulation, support and sun protection decide whether attic PEX does well through a Texas summer and a hard freeze. - Learn [What causes a pinhole leak in copper pipe, and when is it time to repipe?](https://gracklerepipingaustin.com/guide/copper-pinhole-leaks/)A pinhole in copper is the last step of a wall slowly thinning from the inside or outside. This guide explains the mechanisms, what they look like, what Austin's water and soil add, and how the leak pattern decides between a repair and a repipe. ## Nearby service areas - [South Central Austin](https://gracklerepipingaustin.com/service-areas/south-central-austin/)Most flagged galvanized service lines in Austin; a utility pressure-zone project near Oltorf - [Northwest Austin](https://gracklerepipingaustin.com/service-areas/northwest-austin/)Slab leaks on limestone, not clay; rock pushes fixes overhead and pressure runs high - [Kyle](https://gracklerepipingaustin.com/service-areas/kyle/)A permit for any repair that removes concealed piping, and 275-295 mg/L groundwater hardness