San Marcos is a river city and a college town at once, built over the Edwards Aquifer along the Balcones fault line. Plumbing Pros keeps its plumbing running: bungalow repipes, student-rental turnovers, hard-water treatment, and sewer work in karst ground. Describe the symptom and we will put a written price on the fix before any work begins.

Plumbing in a river city over the Edwards Aquifer

San Marcos sits where the Hill Country meets the coastal plain, and the ground tells you exactly where. The Balcones fault zone runs through town, feeding the San Marcos Springs, the second-largest spring system in Texas, which gives the river its famously clear, steady flow. Texas State University anchors the north side with tens of thousands of students, and the Census Bureau's latest estimate puts the whole city at 77,830 residents. That blend of college town and fast-growing suburb shapes every plumbing call.

Drinking water here comes from two places, and the mix matters for your pipes. The city's utility draws groundwater from the Edwards Aquifer and surface water from Canyon Lake, a blend that shifts with the seasons and with drought conditions. Edwards water is limestone water: hard, mineral-rich, and honest about it. The state recognizes San Marcos as a superior public water system, but superior does not mean soft, and scale still finds every fixture it can.

Housing spans two eras with little in between. The older core near downtown and the university holds bungalows and small rentals with decades of layered repairs, while the edges of town keep adding new subdivisions toward Kyle, Buda, and the I-35 corridor. Rental turnover is constant near campus, and a surprising number of service calls begin with a landlord or a tenant discovering what the last one left behind. Each era fails in its own way, and the diagnosis has to match the house.

Drought is the other defining pressure. The Edwards Aquifer Authority manages pumping through drought stages that tighten outdoor watering rules when the aquifer drops, which makes every indoor leak a bigger deal. A running toilet or a weeping supply line wastes water the region cannot spare, and restrictions turn small problems into urgent ones. We treat leak calls during dry spells with the priority they deserve.

When hard cold pushes down from the north, San Marcos gets a different problem: vacant student rentals sitting empty over winter break with the heat turned low. Unoccupied homes do not report their own leaks, and a burst pipe can run for weeks before anyone notices. If you own or manage a rental, a winter check before the break is cheap insurance. Call (877) 401-2673 and tell us what you are seeing.

A crew built for college towns and karst country

Bungalows, rentals, and Edwards limestone water

Plumbing in San Marcos asks for range. One appointment might be an older bungalow with original cast iron, the next a student rental that needs four bathrooms back in service before the semester begins. Our techs read the property first: how the water arrives, how the drains leave, and what the last few owners did in between. We carry camera gear and acoustic leak equipment on every truck, because guessing in karst country gets expensive fast. Findings come with photos and plain-language options in writing. The work gets tested, the mess gets hauled away, and you know exactly what changed.

• Property-first diagnosis: we learn the house's water source, pipe materials, and repair history before recommending anything.
• Written line-item options with firm prices, approved by you before work begins.
• Rental-ready scheduling: turnovers, make-readies, and multi-unit issues handled around tenant calendars.
• Hard-water fluency: tap testing, descaling, and treatment sized to the real mineral number.
• Leak priority during drought: when the aquifer is stressed, indoor leaks jump the line.
• Clean exits on every visit: drop cloths, boot covers, and a tested, wiped-down work area.

Why San Marcos keeps our number

Built for this town's two speeds

• Campus-calendar savvy: We plan rental turnovers and repairs around move-in weeks, so units are ready when leases begin.
• Two-source water knowledge: Edwards groundwater and Canyon Lake surface water behave differently through the year, and we size treatment to what your tap actually delivers.
• Karst-aware sewer work: Camera verification comes first in fault-zone ground, and trenchless repair avoids the surprises that fractured limestone hides.
• Drought-stage urgency: Leaks waste a shared resource here, so we triage them like it matters, because it does.
• Honest repair-versus-replace calls: When a fix will hold, we say so, and when replacement is the smarter money we show our work.
• Same-day hot water: Failed tanks get measured, hauled out, and replaced in most cases on a single visit.
• One crew for the whole system: Drains, supply lines, gas piping, heaters, and fixtures without subcontractor handoffs.

The plumbing calls San Marcos makes most

Hard Edwards water scaling fixtures and heaters

Water drawn from limestone carries its minerals with pride, and San Marcos taps show it. The Edwards side of the city's supply runs hard, leaving scale on showerheads, spotting glassware, and coating heating elements until tanks work overtime. We test hardness at the tap, descale equipment worth saving, and replace parts the minerals already claimed. Then comes the straight answer on treatment: whether a softener earns its keep in your home depends on your blend of aquifer and Canyon Lake water, and we size it to the measured number.

Cast-iron drains in the older core

The bungalows near downtown and the university often still drain through cast iron, and time has not been kind. The pipe corrodes from the inside, the bottom channel thins until it collapses, and scale snags everything passing through. Symptoms arrive as slow drains that no plunger fixes and gurgles that move from fixture to fixture. We camera the line to map the damage, descale and line runs that are still sound, and replace the sections that are past saving, in PVC sized to modern flow.

Slab leaks under shifting soils

Much of San Marcos sits on soils that swell with rain and shrink in drought, and homes on slab foundations feel every cycle. Copper lines under the concrete flex until pinholes open, and the first signs are subtle: a warm spot on the floor, a water bill climbing for no reason, the sound of running water when nothing is on. We locate the break with acoustic equipment and pressure isolation, open the smallest workable section of slab, and test the whole system before the concrete goes back. One dig, done right.

Leaks that matter more during drought

When the Edwards Aquifer Authority tightens drought stages, every gallon counts, and a running toilet can waste thousands of gallons while nobody is watching. Weeping supply lines, dripping hose bibbs, and silent toilet leaks become urgent calls, not someday calls. During dry spells we prioritize leak diagnosis: dye tests for toilets, meter checks for hidden supply leaks, and fast repair of whatever we find. Fixing a leak here is conservation and cost control in the same visit.

Vacant rentals and winter breaks

Student rentals sit empty over winter break with thermostats set low and nobody watching, which is exactly when a hard cold push arrives. A supply line that bursts in an empty unit can run for weeks, and the damage multiplies with every day. Landlords who schedule a pre-break check get shutoffs verified, vulnerable lines insulated, and thermostats set to a safe minimum. If you manage units near campus, that single visit each fall is the cheapest insurance you will buy all year.

Water heaters worked hard by turnover

Rental bathrooms see relentless use, and hard water shortens every tank's life. Sediment builds on the tank bottom, the burner works harder, and the unit gives up years early. In owner-occupied homes the pattern is gentler but the minerals do the same work. We flush serviceable tanks, check gas supply and venting, and test the anode rod where it is reachable. When replacement is the smarter money, we size the new unit to the household's real demand so the hot water holds through the morning rush.

What a service visit looks like

1. Describe the symptom: Call (877) 401-2673 or send a message with what you are seeing: the drip, the gurgle, the cold shower, the bill that jumped. We ask a few targeted questions about the property's age and what you have already tried, then book a window that fits your day. For an active leak or a running main, we walk you through the shutoff before anything else.
2. Diagnose with instruments: The tech verifies the problem on site with real tools. Pressure gets measured at an outdoor bibb, a camera goes down a troubled drain, acoustic gear listens for slab leaks, and a hardness test runs at the tap. You see the readings and the footage yourself. Most diagnoses wrap up within the hour, and fees are explained before we begin.
3. Choose from written options: You get the findings in plain language with line-item choices, including repair versus replace wherever both are honest options. The quoted price is the price you pay. If opening a wall reveals something different from what we expected, we stop and re-quote before proceeding, and you decide how to continue.
4. We do the work to code: Repairs follow current plumbing code and manufacturer specs, with permits pulled where the city requires them. Water stays off only as long as the job demands, and gas work gets pressure-tested before anything is re-lit. Floors and finishes get protected while we work, and the tech keeps you posted if the timeline shifts.
5. Tested, cleaned, and explained: Every fixture we touched gets run and checked for pressure, drainage, temperature, and shutoff function. We walk you through what was done and what to watch for, haul away old parts and debris, and wipe down the work area. The invoice matches the quote, and warranty terms go in writing with your records.

Where we work in San Marcos

From the bungalow streets near downtown and the Texas State campus to the subdivisions spreading along the I-35 corridor, Plumbing Pros covers homes and rentals across 78666 and 78667. Our techs know which blocks still drain through cast iron and which were built entirely with PEX, and the diagnosis fits the property. Student housing near campus gets turnover-ready scheduling, while the family neighborhoods toward Kyle and Buda get the same careful work. The river corridor and the fault-zone ground west of town ask for extra camera time before any sewer recommendation, because karst country hides surprises. East toward the prairie, the questions turn to hard water and heater life. Every visit runs the same way: a window that holds, instruments before guesses, and pricing on paper before work begins. From quiet streets off the square to the busy commercial strips along I-35, one call brings a stocked truck to your curb anywhere in our San Marcos coverage. Don't see your ZIP code? Call (877) 401-2673 and we'll confirm whether your San Marcos street is covered.

Zip Codes We Serve in San Marcos

78666, 78667

Testimonials

Turnover week used to mean plumbing roulette across six units. They walked every bathroom, cleared two drains, replaced a fill valve, and had all six hot water heaters checked before leases began. One invoice, everything documented with photos, and not a single tenant call in the first month. That has never happened before.

Our older bungalow had the original cast-iron drains and they were done. The camera showed the channel rotted out in two spots. They replaced those sections in PVC and lined the rest instead of digging up the whole yard. The crew explained each step, kept the dust down, and the drains run like new.

A slab leak showed up as a warm spot on the tile and a water bill that doubled. They found it with acoustic gear, opened one clean square of slab, and had it repaired and patched in two days. They even checked the pressure regulator while they were at it and found it drifting high. The water bill dropped back to normal the next cycle. Precise, honest, and far less disruptive than I feared.

Frequently Asked Questions

Do you offer emergency plumbing service?

Yes. Burst lines, major leaks, sewer backups, and water heaters that quit in cold weather get priority scheduling. When you call (877) 401-2673, we first talk you through shutting off water or gas to limit damage, then get a tech rolling. Keep your main shutoff accessible and labeled, because those five minutes matter more than any tool we carry. Vacant rentals get the same priority, since an empty unit cannot report its own leak.

Do I need a water softener with Edwards Aquifer water?

Often yes, but the answer depends on your tap, not the city's average. Edwards groundwater runs hard, while the Canyon Lake portion of the blend runs softer, so hardness varies by neighborhood and season. We test at your tap and size any softener to the measured grain count. Blended supplies also mean the number can drift between visits, so retesting at replacement time keeps the sizing honest. If your number is moderate, targeted filtration or regular descaling may be the better value, and we will say so.

Why does a small leak matter more during a drought?

Because the Edwards Aquifer Authority manages the aquifer through drought stages, and every wasted gallon counts against a shared supply. A running toilet can lose thousands of gallons unnoticed, and outdoor restrictions mean you cannot simply water your way out of a brown lawn later. We prioritize leak calls during dry spells: meter checks, dye tests, and fast repairs. It is the rare fix that saves both money and the region's water.

My bungalow still has cast-iron drains. Replace or repair?

It depends on what the camera shows. Sound sections with surface scale can be descaled and lined, which avoids digging. Sections where the bottom channel has thinned or collapsed need replacement in PVC. We map the whole run on camera and price both paths honestly, so you replace only what is truly done. Many bungalows need a mix: spot replacement where the pipe failed, lining where it is still solid.

How do I protect a rental that sits empty over winter break?

Schedule a pre-break visit. We verify every shutoff, insulate vulnerable lines, confirm the thermostat holds a safe minimum, and drain anything that should not sit full. An empty unit cannot report its own leak, so prevention is the whole game. Landlords who do this each fall avoid the spring surprise of a unit that ran water for weeks unnoticed.

How long should my water heater last here?

Harder on rentals than on owner-occupied homes, but minerals shorten every tank. Sediment buildup forces the burner to work harder, and most tanks in this water give up sooner than the label on the tank suggests. Annual flushing buys years, and we check the anode rod and venting each visit. Tankless units paired with scale control sidestep the sediment problem entirely, which is worth pricing out at replacement time. When replacement time comes, we size the new unit to the household's real demand rather than copying whatever was there before.

Does the Canyon Lake water taste different from well water?

Slightly, yes. Surface water carries a chlorine note from treatment that groundwater does not, and the blend shifts through the year. Most households notice it at the kitchen tap. A quality under-sink carbon filter handles drinking and cooking water, which is where the difference matters. We begin with the smallest fix that solves your complaint rather than selling equipment you do not need.

Do you cover both 78666 and 78667?

Yes, both ZIPs are in our San Marcos coverage, from the downtown core and campus area to the subdivisions along I-35 and the edges toward Kyle, Buda, and Martindale. If your street sits near the boundary, call (877) 401-2673 and we will confirm coverage before booking. We only take calls we can reach promptly, so the confirmation keeps response times honest.

Local Weather Risk

Hays County has recorded the following severe weather events since 2015, per NOAA's National Centers for Environmental Information:

• Hail: 68 recorded events (2015–2025)
• Flash Flood: 49 recorded events (2015–2025)
• Thunderstorm Wind: 37 recorded events (2016–2025)
• Tornado: 6 recorded events (2015–2025)
• Flood: 1 recorded event (2017–2017)

Source: NOAA NCEI Storm Events Database.

Our Services

• Backflow Prevention Testing & Installation Near Me — Call for pricing
• Bathroom Plumbing Remodel Near Me — Call for pricing
• Bathtub Repair & Installation Near Me — Call for pricing
• Burst Pipe Repair Near Me — Call for pricing
• Commercial Plumbing Services Near Me — Call for pricing

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