Water Rights Law
Prior appropriation, riparian rights, Clean Water Act permitting, and interstate water disputes.
Overview
Water rights law governs the allocation, use, and protection of water resources. Two primary doctrines divide the United States: the riparian rights system (predominant in the eastern states) and the prior appropriation doctrine (predominant in the western states). Riparian rights attach to ownership of land bordering a watercourse and allow reasonable use of the water. Prior appropriation, summarized as 'first in time, first in right,' grants water rights based on the date of initial beneficial use, regardless of land proximity.
Federal water law intersects with state water rights through numerous statutes. The Clean Water Act regulates water quality and requires permits for discharges into waters of the United States. The Reclamation Act of 1902 authorized federal construction of water storage and delivery projects in the western states, creating a complex body of reclamation law. The Endangered Species Act has profoundly affected water allocation in many western states, requiring minimum flows for protected species.
Interstate water disputes between states are within the original jurisdiction of the U.S. Supreme Court under Article III of the Constitution. These disputes are often resolved through interstate compacts, equitable apportionment decrees, or congressional legislation. Groundwater regulation remains primarily under state control, with significant variation in whether states treat groundwater as connected to surface water or as a separate resource subject to different allocation rules.
Key Statutes
| Statute | Citation | Summary |
|---|---|---|
| Clean Water Act | 33 U.S.C. §§ 1251–1389 | Regulates discharges of pollutants into waters of the United States and establishes water quality standards, NPDES permits, and wetland protections. |
| Reclamation Act of 1902 | 43 U.S.C. §§ 371–616 | Authorized federal construction of irrigation works in the western states, establishing the Bureau of Reclamation and federal reclamation law. |
| Safe Drinking Water Act | 42 U.S.C. §§ 300f–300j-27 | Establishes federal standards for drinking water quality and protects underground sources of drinking water. |
Key Cases
Winters v. United States
207 U.S. 564 (1908)
Established the reserved rights doctrine for Native American tribes, holding that the creation of an Indian reservation implicitly reserved sufficient water for the reservation's purposes.
Sackett v. EPA
598 U.S. 651 (2023)
Narrowed the definition of 'waters of the United States' under the Clean Water Act, requiring a continuous surface connection between a wetland and navigable waters for federal jurisdiction.
Kansas v. Nebraska
574 U.S. 445 (2015)
Interstate water dispute in which the Supreme Court imposed disgorgement damages for Nebraska's knowing violation of the Republican River Compact.
California v. United States
438 U.S. 645 (1978)
Held that federal reclamation law does not preempt state water law, and that states may impose conditions on federal reclamation projects consistent with state water allocation systems.
Key Regulations
NPDES Permit Program Regulations
EPA (40 CFR Parts 122–125)
Implementing regulations for the Clean Water Act's National Pollutant Discharge Elimination System, governing discharge permits and effluent limitations.
Section 404 Wetland Permit Program
U.S. Army Corps of Engineers (33 CFR Parts 320–332)
Regulations governing permits for the discharge of dredged or fill material into waters of the United States, including wetland mitigation requirements.
Common Issues
- Water right priority and allocation during shortages
- Groundwater pumping and aquifer depletion
- Interstate compact compliance and apportionment disputes
- Clean Water Act Section 404 wetland permit requirements
- Federal reserved water rights for Indian reservations and federal lands
- Water transfers and changes in place or type of use
- Instream flow requirements for fish and wildlife
- Municipal water supply and drought contingency planning
State Variations
Water rights law varies fundamentally by region. Eastern states generally follow riparian rights doctrine (reasonable use of water by adjacent landowners), while western states follow prior appropriation (first in time, first in right). Many states in the transition zone (Texas, Oklahoma, Nebraska) use hybrid systems. Groundwater regulation ranges from the absolute ownership rule (Texas historically) to correlative rights and reasonable use doctrines. Some states (Colorado, Montana) have specialized water courts. State water code provisions differ significantly regarding transferability of water rights, instream flow protections, and the relationship between surface water and groundwater rights.
Resources
Bureau of Reclamation
Federal agency managing water and power infrastructure in the 17 western states, operating dams, canals, and irrigation projects.
American Water Works Association
Professional organization for water utilities and professionals, providing standards, research, and policy advocacy.