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Lake Nasworthy sewer improvement project

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The following are questions you may have about the proposed sewer improvement project in the Lake Nasworthy area:

Why are sewer system improvements needed around Lake Nasworthy?

The proposed project would address two needs.

One, economic development is stymied at San Angelo Regional Airport and around Nasworthy because the current wastewater system is operating at its capacity. Mathis Field is perfectly positioned for an industrial park that would boast superior access to transportation by air and by highway. That would be attractive to prospective tenants and would boost job creation. But the current infrastructure cannot accommodate that sort of development. 

Two, the current system relies upon a single, uncased pipeline that crosses the lake. Should that pipeline ever fail, sewage could not be moved, it might seep into the lake, or both. That represents a risk to the community.

How would this project address that risk?

This proposal involves installing two cased mains to move wastewater. That would provide a failsafe that would allow for uninterrupted service should one of the lines fail or require maintenance. And because they would be cased, there would be a minimized threat of sewage leaking into the environment.

Why does San Angelo need a second industrial park?

Development at the current industrial park has increased markedly in recent years. There is no intention of shuttering that park.

But it is hamstrung by having no access to air or rail service. Many industrial tenants seek that so they can easily ship materials in and ship product out. Such manufacturers pay attractive wages and contribute to the local tax base, relieving the burden on homeowners. Great-paying jobs also boost the vibrancy of the entire community’s economy.

Why can’t improvements simply be made to the existing wastewater system at Lake Nasworthy?

Unfortunately, the current system was installed piecemeal over decades without an overall plan. As a result, it relies upon a complex configuration of 26 lift stations and 106 grinders.

Allen Woelke of CDM Smith studied the system and proclaimed it “the most complicated wastewater system I have ever seen” in his 40-year career. He added that the complexity inhibits the flow of sewage, which contributes to odor issues. As Woelke said, “It’s not wine. It doesn’t age well.”

How many lift stations are there total in San Angelo?

52. Again, of those, 26 are at the lake. The City treats 8 million gallons of wastewater per day. The Nasworthy system produces 500,000 gallons of that total. That means half of the city’s lift stations are dedicated to moving 1/16th of the community’s total wastewater. That’s an inefficient system.

Would some of those lift stations be removed if this project occurs?

Yes. Six to eight stations would be removed, if the City Council approves funding that added expense. That would reduce operating and maintenance costs of the wastewater system at the lake.

How much additional capacity to the lake’s wastewater system would this project yield?

The capacity would increase from 500,000 gallons to 2.5 million gallons per day. Woelke assures that would be adequate to accommodate any development around the lake and at the airport.

Would that eliminate odor issues around the lake that migrate toward the loop?

Yes. The system is barely able to keep up with current flows of sewage. That contributes to odor issues.

What other benefits would the project yield?

The infrastructure will include a trunk main – a main artery, if you will – that eventually could serve other areas that currently must rely on septic systems. Again, this would also provide the framework to eventually eliminate six to eight lift stations.

How much will the project cost?

The estimated cost is $32 million.

How would that be funded?

The City proposes tapping into the Lake Nasworthy Fund to help partially pay for the project. That fund contains $15 million, which can be used for any purpose with voter approval.

The balance of that fund grows each time the City sells a parcel of land around the lake. There remain approximately 160 such tracts, which are estimated to generate about $16 million in sales revenue.

The remainder of the project’s cost would be financed using monthly wastewater fees charged to City of San Angelo water customers. Using the fund would lessen the impact of any wastewater rate increase on customers.

How much of the Lake Nasworthy Fund would be used?

The City Council will vote on that prior to calling for an election Nov. 5.

Will the funds be used for anything else?

Yes. The City Council is considering using a portion of the funds voters might approve on several quality-of-life projects at Lake Nasworthy. Those might include a fishing pier, public beaches, and boat ramps and docks.

When can I cast a vote?

Election Day will be Nov. 5. Polls will be open from 7 a.m.-7 p.m. across the county. For a full listing of those, visit City voters may vote at any of those.

There will also be an early voting period.

Where can I learn more?

Visit the City’s website at, the City of San Angelo Facebook page and the City of San Angelo YouTube channel.

Council to explore Nasworthy election

May 22, 2019 - News release 

The City Council is exploring using the Nasworthy Trust Fund to help fund an estimated $32 million sewer project that would allow for greater economic development at San Angelo Regional Airport and to make improvements around the lake.

The Council will also discuss an estimated $5 million in needs the Lake Nasworthy Homeowners Association suggests be funded. Depending upon funding, the suggested projects may include protecting shorelines from erosion; improving public sandy beaches, boat ramps and floating docks; controlling reeds and vegetation; cleaning and deepening canals; and removing or replacing a fishing pier near the Nature Center.

The Council asked the Water Utilities and Finance departments to research scenarios that would involve using varying amounts of the $15 million trust in developing a modern, comprehensive sewer system. If the Council agrees to use any of the fund, it would call an election in November to seek voter approval, in keeping with the terms of the trust.

Nasworthy’s existing wastewater system was installed piecemeal over decades without an overall plan. As a result, it relies upon an intricate system of 106 grinders and 26 lift stations to move sewage to the wastewater treatment plant. The system cannot accommodate plans to develop the airport into an industrial and business park.

“Mathis Field represents a job-creation opportunity we have yet to fully tap,” Mayor Brenda Gunter said. “We will never realize its economic potential if we continue to be hamstrung by the sewer system in that area. If San Angelo is to grow jobs at the airport, we must improve its wastewater infrastructure. Using the trust fund lessens the financial burden on the entire community to pay for this project.”

In April, the City Council backed the $32 million proposal, which would involve installing 28,400 feet of a 24-inch sewer main. The project would install new crossings across the lake and the South Concho River, and should allow removal of some lift stations. Sewage would be moved by gravity flows rather than through pumping, thus reducing maintenance and operating costs. It could also provide sewer service to the Butler Farms and Country Club areas.

A lower-cost option was also studied, but was found to limit growth around Nasworthy and would not reduce operating costs or operational complexity.

The Nasworthy Trust Fund was built – and continues to grow – through the sale of City-owned property around the lake. The City owns 170 tracts around Lake Nasworthy. The average cost per lot is $97,000. 

The fund’s interest earnings will amount to more than $300,000 in the coming fiscal year. Most of those funds are used to support the work of the Lake Operations division, which maintains the public property around Nasworthy. Lake Operations’ current expense budget is $867,523.