Austin Water Service Extension Requests: Who Pays for Off Site Water, Wastewater, and Reclaimed Water Improvements?

What is an Austin Water Service Extension Request?

It is the landowner's or developer's formal request to extend water, wastewater or reclaimed water service to a property. According to Austin Water's Service Extension Request page, landowners and developers use the SER to identify the infrastructure needed and to prepare a preliminary cost estimate.

The requirements sit in the Land Development Code, Chapter 25-9, Article 1, Division 2. Applications go through the Austin Build + Connect portal, and a review fee is invoiced once the application is declared complete.

When do you need a Service Extension Request?

When the existing system is too far away, too small, or a main you are not allowed to tap without one. Austin Water lists three triggers:

• its existing water, wastewater or reclaimed water system is more than 100 feet from the property boundary;
• the existing system is not suitable or sufficient for the level of service the project needs;
• you want to connect to a water or reclaimed water transmission main, or to a wastewater interceptor.

A free Service Availability Letter, typically issued within three business days, is a useful first look. Austin Water says it makes no commitment on capacity and cannot settle whether you need an SER.

Who pays for off-site water, wastewater and reclaimed water improvements?

The developer. Austin Water's page says the costs to design and build the infrastructure the SER identifies are the responsibility of the landowner or developer.

That can mean a main extension when an adequate main does not reach the site, or upsizing when a main reaches the site but lacks capacity. On the wastewater side it can mean a lift station and force main, or work further downstream. The difference between "a main is nearby" and "a main can serve this project" is where unbudgeted off-site work comes from.

When does the City of Austin share the cost?

When it asks you to oversize. In a July 2026 cost participation item for the Water and Wastewater Commission and City Council, the City asked an owner, under Chapter 25-9, to oversize a water main to serve other properties. The City cost participates only to the extent of its proportionate share of the oversized main.

That share needs City Council approval and a cost participation agreement. In that item, the owner still paid financing, easement acquisition, legal services, inspections and permitting. The owner also built to City criteria, followed the City's bidding rules and dedicated the facilities to the City.

So treat cost participation as a negotiated exception, not a payback plan. Do not count on later connections reimbursing you unless your agreement says so.

What decides whether wastewater service needs a lift station?

Elevation, and what is downstream. If the site sits below the nearest gravity main with capacity, sewage has to be pumped. A lift station and force main cost more to build than a gravity line, and someone has to operate them for decades.

Capacity downstream matters as much as the connection point. A trunk sewer or interceptor that is already full can turn a short extension into a longer one. Our post on lift stations and collection systems covers the design side.

Do you have to connect to Austin's reclaimed water system?

Often, yes. Austin Water's reclaimed water page says projects that receive retail water service from Austin Water must connect to the reclaimed system if reclaimed service is available within 500 feet of the property boundary, measured along the closest practicable access route. Projects served by a wholesale customer of Austin Water are exempt, and for a site plan filed before a planned reclaimed extension is built, Austin Water decides case by case.

Reclaimed water serves non-drinking uses such as irrigation, toilets and industrial cooling. Austin Water also publishes supplementary guidance for engineers on calculating reclaimed water demand, so size the irrigation and other non-potable demand early. For irrigation-heavy sites, our post on reclaimed water for golf courses and HOA irrigation goes further.

What about easements across land you do not own?

Budget the time and the cost yourself. An off-site line that crosses other parcels needs easements from those owners. In the cost participation terms above, easement acquisition stays with the owner even when the City shares the pipe.

Walk the likely route during due diligence. A route across one cooperative owner and a route across five parcels are different schedules.

How does an SER fit the development schedule?

Start it early, and do not let the approval lapse. Austin Water recommends submitting during feasibility or preliminary engineering, before a formal development application, and offers a pre-development consultation.

An approved SER expires 180 days after approval unless a formal development application is submitted, in which case it lasts as long as that application. A zoning application does not stop the clock. In the extraterritorial jurisdiction, a property outside Austin Water's certificate of convenience and necessity needs a written annexation request as a condition of service.

Before you close or commit to a site plan, every answer below should be yes. Any no is an open cost or schedule item:

1. Do you have a Service Availability Letter, and do you know whether any of the three SER triggers applies?
2. Do you know the nearest water and wastewater mains with capacity, and the route to them?
3. Have you checked whether the site needs a lift station or downstream capacity work?
4. Have you checked for reclaimed water service within 500 feet?
5. Have you walked the off-site route and identified every easement you would need?
6. Does your schedule submit the development application within 180 days of SER approval?

This is general education based on Austin Water's published guidance as of October 2026. Austin Water decides each request, and its code, fees and criteria change, so confirm the current requirements with Austin Water and your engineer before you close.

Frequently asked questions

How early should we talk to Austin Water about utility service?

During site due diligence, before closing if you can. Austin Water recommends submitting the SER during feasibility or preliminary engineering, before a formal development application, and offers a pre-development consultation.

I'm under contract on a 40-acre tract in Austin's ETJ for a mixed-use project, and the nearest wastewater interceptor is a mile away. Who pays for the line to reach it?

You do, as the developer, for the infrastructure the SER identifies. Austin Water may cost participate if it asks you to oversize the line for other properties, but only for its proportionate share and only with Council approval. Expect an annexation request if the tract is outside Austin Water's CCN.

Does an approved SER reserve capacity for our project?

Do not assume it does. A Service Availability Letter makes no capacity commitment, and an approved SER expires after 180 days unless you file a formal development application. Ask Austin Water how capacity is confirmed at that stage.

I'm a site civil engineer in Austin and our commercial site has a reclaimed main 400 feet away. Does my client have to connect?

If the project gets retail water service from Austin Water, its reclaimed water page says yes when service is within 500 feet along the closest practicable access route. Confirm it with Austin Water during the SER and size the non-potable demand with its guidance.

Related resources

• How to Evaluate Wastewater Utility Options Before You Close on Land (Connect, Build, or Wait)
• What a Utility Feasibility Study Actually Tells You, and When to Get One
• LCRA Water Rights and New Development: What You Need to Know Before Breaking Ground East of Austin
• Edwards Aquifer Recharge Zone Development: What Austin Area Developers Must Do Differently for Wastewater

Evaluating off-site utility costs for an Austin-area site?

We check the triggers, the routes, the lift station question and the reclaimed water requirement during due diligence, so the SER does not surprise you after closing.

We specialize in:

• Site feasibility and utility due diligence
• Water and sewer utility design
• Lift station and force main design
• Reclaimed water and reuse planning
• Site civil and land development
• Construction administration

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