Is Houston Tap Water Safe to Drink? What the City's 2025 Water Report Says

Is Houston tap water safe to drink? It is a fair question. You fill a glass at the kitchen sink, it smells a little like a pool, and you wonder if you should be buying bottled water.

I am not going to hand you my opinion on that. I am going to show you what the City of Houston's own 2025 water report says, what it does not cover, and how to find out about the water at your house.

The short answer from the City's report

The Houston Water Quality Report 2025 covers the City's main system. In it, the City says its drinking water meets or exceeds all state and federal standards, and that the Texas Commission on Environmental Quality has consistently recognized its systems as a "Superior Water Supply System." The EPA says water that meets its standards is safe for drinking, cooking and bathing.

So for City of Houston water, the official answer is yes. But that answer describes the water the City sends out, across a very large system. Two things can change what comes out of your own faucet: where your water comes from, and the pipes inside your house. I cover both below.

What the report found in 2025

Here are the lines people ask about most, from the City's report for its main system:

• Lead, measured at customer taps: 90% of samples were below 5.1 parts per billion (ppb), and no sample was above the 15 ppb action level.
• Arsenic: an average of 1.7 ppb and a high of 6.7 ppb, against an EPA limit of 10 ppb. The report says the water meets the EPA standard but does contain low levels.
• Disinfection byproducts: the highest yearly average was 43.6 ppb for total trihalomethanes (limit 80) and 40.8 ppb for haloacetic acids (limit 60).
• Chloramine, the disinfectant: an average of 2.8 ppm in the pipes, with 4.0 ppm listed as the highest level allowed.
• Hardness: an average of 135.5 mg/L, about 7.9 grains per gallon.

The report also lists two violations for the main system in 2025: one water sample over the turbidity (cloudiness) limit in May, and a missed chlorite monitoring and reporting requirement in September. Both are on page 9 of the report.

Safe and good-tasting are not the same thing

Often the real question is about taste. The water tastes like chemicals, or the coffee is off. The City's report says some things in water can cause taste, color or odor problems that are not necessarily a health concern, and it asks customers with those problems to call 311 or email waterquality@houstontx.gov.

If your water has that pool smell, there is a good chance you are noticing chloramine. It is there on purpose, to keep the water disinfected all the way to your house. The EPA says boiling the water does not remove it, letting it sit out does not remove it, and reverse osmosis filters do not remove it either. Carbon is what does the work.

A whole-home filtration system puts that carbon on the main line where water enters your house, so the kitchen, the shower and the ice maker all get filtered water. I go deeper on this in my post on chloramine in Houston tap water.

The part the City cannot control: your home's pipes

This is the most useful part of the report. The City says lead in drinking water comes mainly from service lines and home plumbing, and that it cannot control the materials used in the plumbing inside your home. So a good result in the City's system does not promise the same result at your faucet.

The report lists a few simple steps:

• Use only cold water for drinking, cooking and making baby formula.
• Before you drink water that has been sitting in the pipes, run it for several minutes. A shower, a load of laundry or a load of dishes does the same job.
• Boiling water does not remove lead.
• The report says a filter certified by an ANSI-accredited certifier to reduce lead is effective at reducing lead exposure.

If lead is your worry, the City offers free lead and copper testing to qualified homes through a survey, and you can email LCR.Program@houstontx.gov. Both are on page 4 of the report.

Where reverse osmosis fits for drinking water

If you want the most treated water where you drink and cook, a reverse osmosis drinking water system is worth a look. It sits under the kitchen sink with its own small faucet, and it pushes water through a very fine membrane that holds back most of what is dissolved in it. The City's report puts total dissolved solids at an average of 260 ppm, and lowering dissolved solids in drinking water is one of the things reverse osmosis helps with.

Two honest notes. Reverse osmosis does not handle chloramine on its own, so in a City of Houston home it works best on top of a carbon filter. And if lead is the reason you are buying, ask what the system is certified to reduce. Ask me that too.

If you are on a MUD, check your own report

Everything above is for City of Houston water. Much of northwest Harris County gets its water from a municipal utility district, or MUD, instead. The North Harris County Regional Water Authority says 143 MUDs take part in its groundwater reduction plan, and it delivers surface water to 61 districts. I have not read those districts' reports, so I will not guess at their numbers.

• Look at your water bill. It names who supplies your water.
• Get that supplier's yearly water quality report, often called a Consumer Confidence Report. It lists the same kinds of lines shown above.
• If you are on City water, my Houston water page breaks down hardness, chloramine and where the water comes from.

If your report shows high hardness, that is an upkeep problem, not a safety one. The City's report sets no limit for hardness, and the U.S. Geological Survey says hardness is not a health concern. Scale, spots and soap film are a water softener job. I explain the City's hardness numbers in my post on hard water in northwest Houston.

The surest answer: look at your own tap

A water report is an average for a whole system. It cannot tell you about your pipes or your faucet. A test at your house can. That is why I test first, for free, before I recommend anything. If your water does not need anything, I will tell you. If it needs a softener, a filter or reverse osmosis, you get one honest, upfront price for the system that fits your house.

Common questions

Is Houston tap water safe to drink?

The City's 2025 report says its water meets or exceeds all state and federal standards, and the EPA says water that meets its standards is safe for drinking. That covers the City's main system. If you are on a MUD, check that district's report. The pipes in your own house matter too.

Why does Houston tap water smell like chlorine?

There is a good chance it is chloramine, the disinfectant the City uses. Its 2025 average in the pipes was 2.8 ppm. According to the EPA, boiling it, letting it sit, or reverse osmosis on its own will not remove it. Carbon filtration helps reduce it.

Does Houston have hard water?

City of Houston water averaged 135.5 mg/L of hardness in 2025, about 7.9 grains per gallon. That falls in the U.S. Geological Survey's "hard" range of 121 to 180 mg/L. It is an upkeep problem rather than a safety one, and a softener is the fix.

Sources

• City of Houston, Houston Public Works, Houston Water Quality Report 2025, Main System (TX1010013). Read 29 Oct 2026.
• U.S. EPA, "Chloramines in Drinking Water". Read 22 Oct 2026.
• U.S. EPA, "How can I remove monochloramine from my drinking water?" (2009). Read 22 Oct 2026.
• Water Quality Association, Technical Fact Sheet: Chloramine. Read 22 Oct 2026.
• U.S. Geological Survey, Water Science School, "Hardness of Water". Read 22 Oct 2026.
• North Harris County Regional Water Authority. Read 20 Oct 2026.