Item 09 - Service Extension Request No. 6451 for 1107 Castle Ridge Road — original pdf

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Item 9 Water & Wastewater Commission: October 14, 2026 Council: October 22, 2026 Posting Language ..Title Recommend approval of Service Extension Request No. 6451 for wastewater service to a 2.85-acre tract located at 1107 Castle Ridge Road within the City’s Drinking Water Protection Zone, the City’s two-mile Extra-Territorial Jurisdiction and Austin Water’s wastewater service area. This action concerns land located within the Barton Springs Zone. Funding: This item has no fiscal impact. The property owner will pay the related infrastructure costs to connect to Austin Water’s wastewater system. Prior Council Action: October 10, 2024 – Council approved Service Extension Request No. 5845 on consent, but this approval expired on April 8, 2025. April 23, 2026 – Council denied Service Extension Request No. 6290. Council Committee, Boards and Commission Action: September 4, 2024 - Not recommended by the Environmental Commission on a vote of 7-1 with Commissioner Nickels voting against the motion to deny the Service Extension Request and Commissioners Cofer and Schiera absent. September 11, 2024 - Water and Wastewater Commission’s motion to recommend approval received five affirmative votes and one dissenting vote. The motion failed for lack of a six-vote affirmative majority with Commissioner Moriarty voting against. Commissioners Turrieta, Musgrove, and Sion were absent. January 28, 2026 – Not recommended by the Environmental Commission on a vote of 7-0 with Commissioners Kruger, Fierro, Luecke, and Morrison absent. February 18, 2026 – Recommended by the Water and Wastewater Commission on a vote of 7-2 with Commissioners Trilli and Ortiz voting against and Commissioner Marzullo absent. October 7, 2026 – To be reviewed by the Environmental Commission. October 14, 2026 – To be reviewed by the Water and Wastewater Commission. Additional Backup Information: The 1107 Castle Ridge Road project consists of approximately 2.85 acres (Property). The Property is located entirely within the City’s 2-mile Extra-Territorial Jurisdiction, Impact Fee Boundary, Austin Water’s service area for wastewater, the Drinking Water Protection Zone, and the Barton Creek Watershed. A map of the property location is attached. The proposed project is identical to the project that Council approved on October 10, 2024 as wastewater SER-5845 and to the project that Council denied on April 23, 2026 as wastewater SER- 6290. Owner: Parkside Homes, LLC (Owner) is proposing to develop three single-family homes. The Owner requested that the City provide retail wastewater service to the Property and Austin Water has determined the service requirements as proposed in Service Extension Request (SER) No. 6451. Travis County Water Control and Improvement District No. 10 will provide retail water service to the Property. City Code § 25-9-35 requires City Council approval for this SER because the Property is not located within either: • • the Desired Development Zone, or the Drinking Water Protection Zone and within the City’s full-purpose corporate limits  Item 9 Water & Wastewater Commission: October 14, 2026 Council: October 22, 2026 Infrastructure Improvements: To serve the Property, the Owner is required to construct approximately 760 feet of 8-inch gravity wastewater main from the existing 8-inch gravity wastewater main in Whitemarsh Valley Walk north to the Property. The proposed wastewater improvements are sized to serve the needs of the Property and will conform to all City Code requirements. These improvements will be designed in accordance with the City’s Environmental Criteria Manual and Utilities Criteria Manual and will be inspected by Austin Development Services. The Owner will construct all required improvements at their cost and dedicate the facilities to the City for ownership, operation and maintenance. All City fees are applicable to the provision of wastewater service including capital recovery fees. City Recommendation: Austin Water has evaluated the Owner’s request for City wastewater service and can provide centralized wastewater service as proposed in SER-6451. A related October 5, 2026 memorandum from the City Manager’s Office states that both Austin Watershed Protection and Austin Water staff recommend approval of SER-6451. This memorandum also includes additional technical information related to providing service to this tract and confirms that a review performed by Austin Watershed Protection found no significant environmental concerns related to providing centralized wastewater service to the Property. If Council approves SER-6451 for wastewater service, any related development applications for the Property will be subject to current City Code, including the Save Our Springs Ordinance and the Watershed Protection Ordinance. If Council does not approve SER 6451, onsite sewage facilities (OSSFs) could be utilized as an alternative wastewater service option. However, the thin and rocky soil type onsite is not ideal for OSSFs and there are severe limitations for septic tank absorption fields and pond construction due to the shallow depth of bedrock. The proposed project is located in zip code 78746, near City Council District 8. Item 09 MEMORANDUM To: From: Mayor and City Council Michael Rogers, Assistant City Manager Susana Carbajal, Assistant City Manager Date: October 5, 2026 Subject: 1107 Castle Ridge Road Wastewater Service Extension Request No. 6451 Service Extension Requests (SERs) located outside of the City of Austin’s full purpose jurisdiction and not within the Desired Development Zone require City Council approval and review by the Environmental and Water and Wastewater Commissions. Austin Water and Austin Watershed Protection staff have completed the review for 1107 Castle Ridge Road Wastewater Service Extension Request (SER) No. 6451, and both departments recommend approval of the request. Summary of Proposed Development The 1107 Castle Ridge Road project consists of approximately 2.85 acres (Property). The Property is located entirely within the City’s 2-mile Extra-Territorial Jurisdiction (ETJ), Impact Fee Boundary, Austin Water’s service area for wastewater, the Drinking Water Protection Zone, the Barton Creek Watershed, the Barton Springs Zone, and the Edwards Aquifer Contributing Zone. The Property is generally located west of Loop 360 and north of Lost Creek Boulevard, near City Council district 8 in zip code 78746. There is an existing single-family home on this lot that receives water service from Travis County Water Control and Improvement District (WCID) No. 10 and has a privately owned and operated onsite sewage facility (OSSF) for its wastewater service. Parkside Homes, LLC (Owner) is proposing to demolish the existing home, abandon the OSSF, and redevelop the tract with three single-family homes. The Owner requested that the City provide centralized wastewater service to the Property. In response to the request, Austin Water determined that the Owner must construct infrastructure to receive wastewater services from Austin Water. These requirements are reflected in SER No. 6451. Travis County WCID No. 10 will continue to provide retail water service to the Property. The Owner previously submitted SER No. 5845 and SER No. 6290. The initial application for SER No. 5845 was approved on consent by City Council on October 10, 2024, but subsequently expired. The Owner later submitted SER No. 6290 but it was denied by City Council on April 23, 2026, over concerns related to the ability for the property to remove itself from the ETJ, thereby no longer being held to the high standards of environmental protections required by the Save Our Springs Ordinance Date: Subject: October 5, 2026 1107 Castle Ridge Road Wastewater Service Extension Request No. 6451 Nearby SER Activity There are three previous water SERs located within one-half mile of the Property. Of these, one was approved by City Council, one was withdrawn prior to City Council consideration, and one application expired. For wastewater, there have been seven SER applications located within one-half mile of the Property, including two previous SERs for the Property. Of these, two were approved by City Council (including one for the Property), two were administratively approved, one was withdrawn prior to City Council consideration, one for the Property was denied by City Council, and one application expired. Austin Water Summary Austin Water staff have performed a technical review of the current wastewater SER application and have developed the wastewater service plan as outlined in SER No. 6451. The draft SER proposes an 180-foot extension from the nearest public wastewater main in Whitemarsh Valley Walk to the Property and an additional extension in an easement within the Property to serve the three proposed lots. The SER improvements will not cross any known environmental features. The Owner will be required to submit a subdivision plat to subdivide the property into three lots and construction plans for the related utility, drainage, water quality, and driveway improvements. The plat application and construction plans will be subject to all City of Austin code requirements and design criteria for properties located in the ETJ. The SER improvements will conform to all City Code requirements, be designed in accordance with City’s Environmental Criteria Manual and Utilities Criteria Manual and will be inspected by Austin Development Services. Therefore, Austin Water recommends approval of wastewater service as outlined in Service Extension Request No. 6451. Austin Watershed Protection Summary Austin Watershed Protection (WPD) staff completed the review of the current SER and recommend approval of the request. In the Barton Creek Watershed outside of the Edwards Aquifer Recharge Zone, the Save Our Springs Ordinance limits the total amount of allowable watershed impervious cover to 20% of the net site area and construction on slopes greater than 15% would be limited. Based on the available information, a significant portion of the site contains slopes greater than 15%. No critical environmental features were identified, and the site is not within the critical water quality zone or water quality transition zone of Barton Creek. The site does not drain to occupied salamander habitat. If the City does not extend wastewater service to the site, OSSFs would be utilized as an alternative service option. However, the thin and rocky soil type onsite is not ideal for OSSFs and there are severe limitations for septic tank absorption fields and pond construction due to the shallow depth of bedrock. Additionally, Travis County rules require a lot size of at least one acre for OSSFs, and the currently proposed development would need to be redesigned for only two lots. A two-lot design would not necessarily reduce the total amount of impervious cover of the proposed Page 2 of 3 Date: Subject: October 5, 2026 1107 Castle Ridge Road Wastewater Service Extension Request No. 6451 development because the applicant would likely maximize the allowable impervious cover whether there are two or three lots. WPD staff did not recommend approval of the previous SERs (No. 5845 or SER No. 6290) primarily due to environmental impacts if the property were to be removed from the 2-mile ETJ (an option granted to property owners by Senate Bill 2038 effective September 1, 2023). Since then, it has been discovered that the Property is not eligible to petition for removal from Austin’s 2-mile ETJ because of its proximity to the Bee Caves Armory. Based on this new information, the site will be required to submit a site plan to Austin Development Services and comply with the applicable requirements in Austin’s Land Development Code for properties in Austin’s ETJ. This includes compliance with the Save Our Springs (SOS) Ordinance and environmental requirements such as impervious cover limits, creek and critical environmental feature protections, stormwater quality treatment standards, cut and fill limits, and slope protections. Therefore, WPD’s concerns about compliance with the City’s development regulations are no longer applicable and WPD recommends support for the approval of SER No. 6451. Other Community Considerations The property lies within the Camelot Section 3 subdivision, which was recorded in 1969. The proposed project will add two more houses to the Camelot Section 3 subdivision. This project aligns with City Council’s goals of increasing housing supply in the Austin community. The proposed subdivision of this existing large-lot single-family tract will result in similar density as the Lost Creek subdivision that is adjacent to and immediately south of this project. The existing subdivision was not subject to current environmental regulations, including the Save Our Springs Ordinance and Watershed Protection Ordinance, but a future subdivision would be subject to current water quality treatment requirements and environmental protections, including impervious cover limits. Consolidated City Recommendation In consideration of all factors related to this development, Austin Water and Austin Watershed Protection recommend approval of Service Extension Request No. 6451. Should you have any questions or concerns, please contact Austin Water Director Shay Ralls Roalson (Shay.Roalson@austintexas.gov) or Austin Watershed Protection Director Jorge Morales (Jorge.Morales@austintexas.gov). cc: T.C. Broadnax, City Manager Erika Brady, City Clerk Jason Hadavi, City Auditor Mary Jane Grubb, Municipal Court Clerk Judge Sherry Statman, Municipal Court CMO Executive Team Department Directors Shay Ralls Roalson, P.E., Director, Austin Water Jorge L. Morales, P.E., CFM, Director, Austin Watershed Protection Page 3 of 3 D25 BARTON CREEK D24 LOCATION MAP 1107 Castle Ridge Road Wastewater SER-6451 VIREO CV BEE CREEK CANON WREN DR F M 2 2 4 4 R D R N RIM D O Y N A C N E L G L RID L A W E N O T S LEDGEROCK CIR VALLEY RIDGE CT WHITEMARSH VALLEY WALK Item 09 FLINTRIDGE RD BEE CAVE RD EANES CREEK WIL S O N H E IG H T S D R T H A D D E U S C V E25 D R E G D I R E L T S A C B S Y W H S A X E T F O L A T P A C S I E24 D N G E E LIVIN H T R R D O O M T R A D ETERNITY TER R E D G R RID E K A U Q ARRO NIMINK CIR BAY HILL DR E23 ST ANDREWS WAY DIAMOND HEAD CIR LOST CREEK BLVD Basemap Polygon D23 Street Names Railroad GRID Austin Impact Fee Boundary Subject Tract (wastewater) Full-Purpose City Limit 2-Mile ETJ 5-Mile ETJ BARTON CREEK Limited-Purpose City Limit Unincorporated County West Lake Hills City Limits C Y P R E S S P O N T W E S T I LOST CV MAUNA KEA DR D O R A L D R West Lake Hills ETJ / 0 FRONT ROYAL DR R AL D KEY WEST CV RT R PO Y O 500 1,000 2,000 Feet 3,000 This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does not represent an on-the-ground survey and represents only the approximate relative location of property boundaries. This product has been produced by the City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness. 8/11/2026 City of Austin Council Meeting Backup: October 22, 2026File ID: 26-27021 of 1 Item 09 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%!P!P!P!P!P!P!P!P!P!PFALCONLEDGE DRCASTLERIDGERDWHITEMARSHVALLEYWALKTORREYPINESCVINDIANCANYONDRJOUSTINGPLMINIKAHDACVINDIANCANYONCVGLENNCV850860870840830820810800790780770760750740730720710700690680670660880650640890630900800810800770810810880890D248"PVC8"PVC8"PVC8"PVC8"PVC8"PVC8"PVC8"PVC8"PVC8"PVC8"PVCW.W. S.E.R. Name: 1107 Castle Ridge RoadW.W. S.E.R. Number: 6451.Utility Development Services Plotted 07/06/20260200400600100FeetSubject Tract100-yr FEMA FloodplainCritical Water Quality ZoneFull-Purpose City Limit2-Mile ETJUnincorporated Travis CountyThis product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. It does notrepresent an on-the-ground survey and represents only the approximate relative location of the property boundaries. This product has been produced bythe City of Austin for the sole purpose of geographic reference. No warranty is made by the City of Austin regarding specific accuracy or completeness.STAFFPROPOSEDAPPROXIMATELY760FEETOFAPPROPRIATELYSIZEDGRAVITYWASTEWATERMAINDRAFTCity of Austin Council Meeting Backup: October 22, 2026File ID: 26-27021 of 1