Optimizing Small Water Treatment Plants Tips and Tricks for Rural Providers

What should you monitor and maintain at a small plant?

Track the records the rules require, then the numbers that show how well the plant runs. In Texas, 30 TAC §290.46 sets the minimum operating practices for public water systems.

A plant treating surface water must record the amount of each chemical used and the volume of water treated and distributed every day, and keep those records at least two years (§290.46(f)).

Maintenance has its own minimums (§290.46(m)):

• inspect every ground, elevated and pressure tank once a year
• check that tank instruments and controls work, also once a year
• inspect pressure filter media and internal surfaces once a year
• change cartridge filters at the manufacturer's frequency or sooner

For surface water plants, turbidity is the scorecard. The Texas Optimization Program goals, set by EPA when the program began in 1994, are:

• settled water turbidity of 2.0 NTU or less, continuously
• 0.10 NTU or less at the discharge of each filter
• a spike no higher than 0.3 NTU after a filter backwash
• back to 0.10 NTU within 15 minutes after a clean filter returns to service

In Colorado, CDPHE's surface water treatment rule page carries the monthly operating report forms for turbidity and disinfectant monitoring. CDPHE's Policy DW004 and its guidance define what the state considers a properly operated surface water plant and the practices it checks during sanitary surveys.

How do you tune the treatment process without new equipment?

Use the state's optimization help and your own data. TCEQ's Texas Optimization Program offers Special Performance Evaluations at surface water plants. It also gives customized help with problems such as iron and manganese, disinfection byproducts, chloramines and nitrification.

The recognition program is voluntary. When filters exceed set turbidity levels in consecutive months, though, TCEQ requires an on-site performance evaluation, which it calls a mandatory CPE.

EPA's Area-Wide Optimization Program takes the same approach nationally. EPA says some systems can meet optimization goals with their existing treatment and infrastructure.

Tuning at a conventional plant looks at coagulant dose, filter runs and backwash practice, and disinfectant contact time. Colorado's CDPHE posts a CT calculator (disinfectant concentration times contact time) and baffling factor guidance for that last item.

Where does a small plant save energy?

Start with pumping. EPA's energy efficiency page for water utilities says as much as 40 percent of a drinking water system's operating costs can be energy. It names pumping as an energy-intensive process every utility should understand.

EPA says plants that add efficiency practices can save 15 to 30 percent. Start with a baseline from a third-party energy audit or a self-assessment. EPA's free tools include:

• the Energy Use Assessment Tool, an Excel workbook built for small and medium systems
• ENERGY STAR Portfolio Manager, for tracking energy and water use
• the Energy Management Guidebook for Wastewater and Water Utilities

Before you replace a pump or motor, match its duty point to actual demand. A pump that runs far from its best efficiency point uses more energy for the same water.

What training do operators need?

A licensed operator in charge, trained on every chemical in the plant. Texas requires treatment and distribution facilities to run under the direct supervision of a licensed water works operator, who may be an employee, contractor or volunteer (§290.46(e)).

Operators must be trained on all chemicals used in the plant. License class scales with the system. For example, a groundwater system serving 250 or fewer connections needs a Class D or higher operator, and one serving 251 to 1,000 needs Class C or higher.

In Colorado, the Water and Wastewater Facility Operators Certification Board sets facility classifications in Regulation 100, and each facility must run under an operator in responsible charge certified at or above its class. In Texas, TCEQ also offers free on-site financial, managerial and technical assistance to water systems.

How do you pay for improvements?

Through the state revolving funds, which favor planned projects. TWDB's Drinking Water State Revolving Fund covers planning, acquisition, design and construction, including upgrading or replacing water systems and correcting water quality, capacity, pressure and water loss problems.

Community water systems, including nonprofit water supply corporations, can apply. Small and disadvantaged systems may qualify for principal forgiveness. The solicitation opens in December and closes in March. File a project information form by the deadline to be invited to apply under the initial Intended Use Plan.

In Colorado, CDPHE's State Revolving Fund page says the fund finances design and construction, run with the Department of Local Affairs and the Colorado Water Resources and Power Development Authority. CDPHE says you cannot receive this funding unless you take part in its annual eligibility survey. The next survey opens May 1, 2027.

When is the answer an upgrade instead?

When the plant is short of capacity, or tuning stops working. In Texas, 30 TAC §290.45 requires a community water system on surface water to have treatment plant capacity of 0.6 gallons per minute per connection under normal rated design flow.

A retail public utility holding a certificate of convenience and necessity must file a planning report once it reaches 85 percent of the most restrictive minimum capacity requirement (30 TAC §291.93(3)).

Other signs it is time to plan an upgrade:

• the plant still misses optimization goals after a performance evaluation and tuning
• repeated turbidity exceedances keep triggering evaluations
• equipment has reached the end of its life and parts are hard to get

EPA notes that for systems with inadequate or aging infrastructure, the optimization approach may identify the capital improvements needed. Our page on water treatment design in Colorado covers that next step.

Is your plant ready for an optimization review?

Answer yes or no. If you answer no to two or more, start with the records.

1. Do you have two years of daily chemical use and treated volume records?
2. Do you trend individual filter turbidity, not just the combined reading?
3. Were all tanks, and any pressure filters, inspected in the last year?
4. Do you know your plant's capacity per connection against the state minimum?
5. Do you have a year of electric bills tied to each pump station?
6. Is every operator trained on every chemical in use?

Take the answers to your engineer and ask which problems are operations, which are design, and what the state's free help can cover first. We do this work with utilities and municipalities.

A note on limits: this is general education from TCEQ, CDPHE, TWDB and EPA sources as of October 2026. Texas and Colorado rules apply only in those states, and your engineer and the regulator have the final word.

Frequently asked questions

What is the Texas Optimization Program?

A TCEQ program that gives advanced technical help to public water systems and recognizes surface water plants that meet its strict turbidity recognition criteria for 12 consecutive months. Recognition is voluntary.

What triggers a mandatory performance evaluation (mCPE) at a Texas plant?

Filters at a surface water treatment plant exceeding set turbidity levels in consecutive months. The system then takes part in an on-site evaluation.

I run a small groundwater system in rural Texas with about 400 connections. What operator license do we need?

Under §290.46(e), a groundwater system serving more than 250 and up to 1,000 connections needs an operator with a Class C or higher groundwater license. Check the rule for your exact case.

I'm the manager of a small Colorado water district, and our board wants a new plant. How do we know whether tuning the old one would be enough?

Ask for a performance evaluation first. It shows whether the limits are in operations or in the design. If the design is the limit, the evaluation becomes the basis for the upgrade project.

Related resources

• Innovative Water Treatment Technologies for Rural Communities: Affordable and Sustainable Solutions
• Why a Detailed Water Loss Analysis Matters for Rural Communities
• Package Plant Operator Staffing Requirements: What TCEQ Certification Level Does a Development Actually Need?
• The USDA Water and Waste Disposal Loan and Grant Program in Texas: Who Qualifies and How It Works

Is your small plant ready for a fix or a rebuild?

Send us your operating records and the last state inspection. We will help you sort what tuning can fix from what needs design.

We specialize in:

• Water treatment, storage tank and intake design
• Facility assessment and gap analysis
• Water distribution system design
• Funding applications and engineering reports
• Construction administration

Modern Engineering Solutions, McKinney, Texas. Contact: (214) 833-6748 or mod-eng.com