Save Our Springs Alliance, Inc. v. Texas Commission on Environmental Quality and the City of Dripping Springs, 713 S.W.3d 308

Save Our Springs Alliance, Inc. (SOS) challenged the Texas Commission on Environmental Quality’s (TCEQ) final order granting the City of Dripping Springs a permit to discharge treated wastewater into Onion Creek.
The dispute focused on the interpretation and application of TCEQ’s antidegradation rules, particularly whether TCEQ properly evaluated water quality impacts from the discharge.
TCEQ assessed degradation by considering the overall impact on the waterbody, rather than focusing solely on numeric changes to individual water-quality parameters like dissolved oxygen (DO).
The administrative and technical review process included modeling, public comment, federal EPA review, and a contested-case hearing; ultimately, the permit imposed some of the state’s most stringent effluent limits.
After a split between the trial and appellate courts, the Supreme Court of Texas reviewed whether TCEQ’s chosen assessment method and the adequacy of its findings satisfied state law.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Proper Antidegradation Standard	SOS: TCEQ must use a parameter-by-parameter approach, so any significant change in a single parameter (e.g., DO) constitutes degradation.	TCEQ: The rules require analysis of whole water quality, not just parameter-by-parameter; only a more-than-de minimis lowering of overall water quality matters.	Court affirmed TCEQ’s whole-water approach as consistent with the rules.
Compliance with Tier 1 and Tier 2 Standards	SOS: Predicted drops in certain parameters violate both tiers; Tier 2 requires separate, stricter analysis.	TCEQ: Overlapping analyses are permitted; no evidence tier distinctions were improperly disregarded.	Court found substantial evidence for compliance with both tiers.
Sufficiency of Agency Findings	SOS: The final order lacked sufficiently detailed findings of underlying facts, especially regarding DO.	TCEQ: Findings were adequate and not required to restate statutory language or every underlying fact, especially as SOS did not preserve this argument.	No additional findings required; final order sufficient.
Statutory and Federal Law Consistency	SOS: TCEQ’s whole-water approach conflicts with the Clean Water Act’s objectives and related guidance.	TCEQ: Texas rules control in this state-law review; EPA has approved the approach, and guidance documents do not override state law.	Court only assessed compliance with Texas statutes and affirmed TCEQ’s method.

Ammonite Oil & Gas Corp. v. R.R. Comm’n of Tex., 698 S.W.3d 198 (Tex. 2024) (describing the substantial evidence review standard and deference to agency expertise)
Dyer v. TCEQ, 646 S.W.3d 498 (Tex. 2022) (addressing standards for agency review and amendment)
City of El Paso v. Pub. Util. Comm’n of Tex., 883 S.W.2d 179 (Tex. 1994) (setting standards for agency arbitrariness and discretion)
Texas Health Facilities Comm’n v. Charter Med.-Dall., Inc., 665 S.W.2d 446 (Tex. 1984) (requirements for agency findings under the APA)
Pub. Util. Comm’n of Tex. v. Tex. Indus. Energy Consumers, 620 S.W.3d 418 (Tex. 2021) (presumption and burden in agency findings)