Item 6C and 6D - MemoItems 6C and 6D
ICITY OF
SOUTHLAKE
MEMORANDUM
August 4, 2025
To: Alison Ortowski, City Manager
From: Lauren LaNeave, Interim Director of Public Works
Subject: Ordinance No. 1294, 2nd Reading, an amendment to
Chapter 9.5, Article 3 of the Southlake City Code,
updating the Industrial Wastewater Pretreatment
Program.
Resolution No. 25-028, supporting the funding,
implementation, and enforcement of the Wastewater
Pretreatment Program that is interconnected to the
Denton Creek Regional Wastewater System owned and
operated by the Trinity River Authority.
Action
Requested: Ordinance No. 1294, 2nd Reading, an amendment to Chapter
9.5, Article 3 of the Southlake City Code, updating the
Industrial Wastewater Pretreatment Program.
Resolution No. 25-028 supporting the funding,
implementation, and enforcement of the Wastewater
Pretreatment Program that is interconnected to the Denton
Creek Wastewater System owned and operated by the Trinity
River Authority.
Background
Information: The City of Southlake is contracted with the Trinity River
Authority (TRA) to treat received wastewater. All of
Southlake's wastewater flows to either TRA's Denton Creek
or Central Regional Wastewater facilities to be treated.
Similarly to Southlake, TRA operates on a Texas Pollutant
Discharge Elimination System Stormwater permit, requiring
routine updates to control stormwater pollution. In 2024, the
City of Southlake adopted the Central Regional Wastewater
System's revised Pretreatment Program, under Ordinance
No. 836-A and Funding Resolution No. 24-045.
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Items 6C and 6D
In 2023, the Trinity River Authority Denton Creek facility
submitted a revised pretreatment program to the Texas
Commission on Environmental Quality (TCEQ), which
included updates to the hazardous waste discharge
notification process, the dental amalgam rule, and proposed
technically based local limits (including allowance decrease in
Copper and Lead and allowance increase in Cadmium, Nickel
and Zinc). As of May 6, 2025, the TCEQ has reviewed TRA's
pretreatment program and designated it as "technically
complete."
As a customer city, Southlake must enact equally or more
stringent regulations pertaining to wastewater content and
pretreatment. All customer cities of TRA must obtain a signed
attorney statement, proceed with adequate public notice, and
pass the program through the City Council.
Comparatively to the ordinance passed for the Central
Regional Wastewater System in 2024, there are only three
changes to the ordinance: inclusive language to address both
treatment facilities in the preamble, the insertion of
"categorical" under the definition of Total Toxic Organics, and
the local discharge limits for the Denton Creek facility. All
changes are marked in the ordinance attachment.
Financial
Considerations: There is no cost associated with this program update at
present. If an industrial site enters Southlake, there would be
a cost to provide industrial sampling and analysis services
through TRA. While the cost is dependent on the number of
samples and contaminants analyzed, historically we have
spent approximately $1,250 per quarter on industrial
sampling.
Staff will be proposing a new fee in the FY 2026 fee schedule
to ensure cost recovery for sampling services.
Strategic Link: The ordinance and funding resolution link to the City's
strategy map relative to the focus area of Performance
Management & Service Delivery. The specific corporate
objectives that are met by this ordinance are B1 Achieving
strong outcomes through continual evaluation and pursuit of
better practices that improve core business operations.
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Items 6C and 6D
Citizen Input/
Board Review: Ordinance No. 1294 was approved on consent by City
Council on 1st reading on August 5, 2025. No changes were
made between the first and second reading.
The previous adoption of the Pretreatment Program for the
Central Regional Wastewater System was approved in
December 2024.
Legal Review: The City Attorney reviewed Ordinance No. 1294 and
Funding Resolution No. 25-028.
Alternatives: The City Council may approve or deny Ordinance No. 1294
and Funding Resolution No. 25-028.
Supporting
Documents:
Attachment A: Ordinance No. 1294
Attachment B: Attorney Statement (to be signed following
approval)
Attachment C: Enforcement Response Plan
Attachment D: Resolution No. 25-028
Staff
Recommendation: Approve Ordinance No. 1294, 2nd Reading, an amendment to
Chapter 9.5, Article 3 of the Southlake City Code, updating
the Industrial Wastewater Pretreatment Program.
Approve Resolution No. 25-028 supporting the funding,
implementation, and enforcement of the Industrial
Wastewater Pretreatment Program that is interconnected to
the Denton Creek Wastewater System owned and operated
by the Trinity River Authority.
Staff Contact: Lauren LaNeave, Interim Director of Public Works
Jack Thompson, Deputy Director of Public Works
Madisson Dunn, Environmental and Regulatory Supervisor
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