Service area · Hays County
Water treatment in San Marcos, Texas
San Marcos is a water town, and the same limestone that keeps the river clear makes the tap water very hard. We test, install, and service softeners, whole-home filtration, and reverse osmosis across San Marcos, and every job starts with a free test at your tap.
Local numbers
What comes out of a San Marcos tap?
The city blends aquifer water with treated regional supply, and every source in the mix has traveled through limestone.
16gpg
Average hardness in San Marcos (14 to 18 range)
2024 CCR
10.5gpg
Where “very hard” starts on the USGS scale
USGS
30min
Free in-home water test, results on the spot
Figures are typical values, not your house's number. With blended sources, neighborhoods can test differently on the same day, and the free test settles what your home actually gets.
What fits your house
Match the symptom to the system
Most San Marcos homes need one or two of these, not all three. The water test tells us which, and the recommendation is only ever sized to what your water shows.
San Marcos housing runs the full range, from pre-loop houses near downtown where we add the connection to newer communities on the edges of town where the loop is usually roughed in. Both are routine installs, and we quote the difference plainly up front.
Questions
Questions we get about San Marcos water
Is San Marcos tap water safe to drink?
Yes. The city's water is TCEQ-regulated, continuously tested, and reported in an annual Consumer Confidence Report. Hardness and chlorine taste, the things people actually notice, are quality-of-life issues rather than safety issues, and that's the honest frame we work from.
San Marcos sits on famous springs. Why is my tap water so hard?
Because the same limestone that makes the springs clear also loads the water with calcium and magnesium. Spring-clear and mineral-heavy aren't opposites. Around here they're the same geology. Very hard water is the normal condition at a San Marcos tap.
Where does San Marcos water come from?
It's a mix that includes local aquifer supply and treated surface water brought in through regional partners. The blend can vary by neighborhood and season, so two houses across town can test differently on the same day. Your tap is the only number that matters for your home.
I rent near campus. Can I still do anything about the water?
Installing equipment usually needs the owner's sign-off, and plenty of landlords say yes when a tenant asks, especially for an under-sink RO that protects nothing but the drinking water. If you own a rental here, a softener is cheap protection for water heaters between tenants. Either way we're happy to test first and put numbers on it.
Do you serve the newer developments outside the loop?
Yes. We cover all of San Marcos and the surrounding parts of Hays County, from the older streets near downtown to the newer communities on the edges of town, and most of those newer builds already have a softener loop waiting.
Book your free water test in San Marcos
The test takes 30 minutes at your tap, you get real numbers on the spot, and we explain what they mean in plain English. You keep the results either way.
What you get
- Hardness, chlorine, iron, and TDS tested at your tap
- Results explained in plain English, yours to keep
- A recommendation sized to your home (only if you want one)