Before It Reaches Your Tap: The Canal Behind Baytown's Drinking Water

Baytown's tap water is surface water. It is pumped from the Lake Houston area, travels by canal, gets treated after it arrives, and is tested all year. The Baytown Area Water Authority (BAWA) publishes a yearly water quality report. The latest covers reporting year 2025, Jan. 1 through Dec. 31, 2025.

The report is called a Consumer Confidence Report, or CCR. It names the system as public water system ID 1010003 and says the drinking water arrives through the Coastal Water Authority canal. It starts as river and lake water and moves through open canal before it reaches the city.

The short version

• The 2025 report says Baytown's water is surface water delivered through the Coastal Water Authority canal.
• The Coastal Water Authority was created in 1967 and delivers untreated surface water to Baytown, Houston and Deer Park.
• It draws from Lake Houston and the Trinity River.
• The public water system ID is 1010003.
• The report for 2025 lists 1 Level 1 and 1 Level 2 coliform assessment, all completed. The Level 1 assessment led to 2 corrective actions. The Level 2 led to none.

From the lake to the canal

The Coastal Water Authority started as the Coastal Industrial Water Authority, created by the legislature in 1967. The legislature renamed it in 1985 to reflect a service area that spans Harris, Chambers and Liberty counties.

The authority draws from Lake Houston and the Trinity River, and it operates the Lake Houston Dam and Reservoir under contract. Lake Houston was formed in 1953 by an earthen dam on the San Jacinto River, about 18 miles northeast of downtown Houston.

One unusual detail: the authority has no power to tax. It finances its canals and pump stations with revenue bonds. Revenue bonds are paid back from what the authority earns selling water.

What the city does with it

The authority delivers the water untreated, so treatment comes after it arrives. Customers pay the city for water and sewer. The city's FY2027 budget raises water rates by 4.5% and sewer rates by 12.4%. Our water bill story walks through each line of the bill.

Reading the water quality report

Each year a water quality report is posted in the city's online archive, the Archive Center on baytown.org. Search it for "water quality report" or "Consumer Confidence Report." For reporting year 2025, the data cover January 1 through December 31, 2025. The report names the system as PWS ID 1010003. You can also look up the system by that ID on the Texas Commission on Environmental Quality's public water system search.

Read the latest report once, even if only the first page. It lists where the water comes from, what was tested and what was found. A new report comes out each year, so the next one covers 2026.

Coliform assessments

The 2025 report lists two coliform assessments. One was a Level 1 assessment with 2 corrective actions. The other was a Level 2 assessment with 0 corrective actions. The report shows all of them as completed.

Here is what that means. Coliform bacteria are a signal water systems test for, because they can show that something in the pipes or the sampling needs a closer look. Under the federal rule, a system must run an assessment when its coliform results pass a set frequency, or when it misses required repeat samples after a positive routine sample. A Level 2 is the deeper of the two reviews. Any defect an assessment finds must be fixed. Those fixes are the corrective actions.

An assessment in a water report is a review, not a headline. If you want the reason behind each one, read that section of the report. The city's utility staff can answer questions about it.

A different canal next door

Not every Baytown-area water story runs through the same canal. The San Jacinto River Authority's Highlands Division moves water through more than 27 miles of canal running from Lake Houston to a reservoir near Highlands. Industrial users there buy more than 80 million gallons a day, and Exxon and Chevron are two of its large industrial customers. Crosby, Newport and Barrett Station buy their municipal water from the same canal network.

That is a separate system from Baytown's. It shows how much of the region's water moves by canal instead of pipe.

Water downstream

Fresh water matters after it leaves the tap, too. Freshwater flowing into Texas bays regulates the salinity that governs spawning, larval survival and growth for estuarine species such as redfish, according to Texas Parks and Wildlife. Trinity Bay, the northern arm of the Galveston Bay system, stretches about 20 miles and receives more than half of the entire bay complex's freshwater inflow.

Groundwater has its own story

Groundwater near Baytown is part of the area's history, too. A U.S. Geological Survey study found as much as 8.2 feet of land subsidence around Burnet, Scott and Crystal Bays by 1973. Pumping from large industrial wells began around 1918 and was the main driver. The Harris-Galveston Subsidence District, created by the Texas Legislature in 1975, was the first political subdivision of its kind in the country formed specifically to regulate groundwater and curb subsidence.

What this means for you

Read the latest report once, even if only the first page. Note the system ID, 1010003, so you can find the right report. If you have a question about a taste or an odor, ask the city's utility staff. If a boil-water notice or water restrictions make the news, ask where the issue sits: at the source, at the treatment plant or in the pipes that reach your street. That tells you who is fixing it and how long it may take.

Sources

• Baytown Area Water Authority: Annual Water Quality Report, reporting year 2025 (City of Baytown Archive Center, ADID 1263, https://baytown.org/Archive.aspx?ADID=1263)
• Baytown Area Water Authority: Annual Water Quality Report, reporting year 2025, coliform assessment section (City of Baytown Archive Center, ADID 1314, https://baytown.org/Archive.aspx?ADID=1314)
• Coastal Water Authority: About (https://www.coastalwaterauthority.org/about/)
• U.S. Environmental Protection Agency: Revised Total Coliform Rule (https://www.epa.gov/dwreginfo/revised-total-coliform-rule-and-total-coliform-rule)
• Texas State Historical Association: Lake Houston (https://www.tshaonline.org/handbook/online/articles/rol42)
• San Jacinto River Authority: Highlands history (https://www.sjra.net/highlands/history/)
• U.S. Geological Survey: Water-Resources Investigations Report 74-21 (https://pubs.usgs.gov/publication/wri7421)
• Harris-Galveston Subsidence District: History (https://hgsubsidence.org/about/history/)
• City of Baytown: FY2027 Adopted Budget (https://baytown.org/Archive.aspx?ADID=1317)
• Texas Parks and Wildlife Department: Estuaries (https://tpwd.texas.gov/fishboat/fish/didyouknow/coastal/estuaries.phtml)
• Galveston Bay Estuary Program: Galveston Bay 101 (https://gbep.texas.gov/galveston-bay-101/)