No. 20-7028October Term 2020Decided Jul 2, 2021
Mast v. Fillmore County
This case asks how demanding RLUIPA is when a county denies a religious exemption from septic and land-use rules.
Case status
- Current stage
- Decided
- Latest event
- Decision released Jul 2, 2021
- What it's about
This case involves Swartzentruber Amish families in Minnesota who say county land-use and septic-system requirements force them to use modern technology in ways that violate their religious beliefs. The dispute centers on how strictly courts must apply the Religious Land Use and Institutionalized Persons Act when a local government refuses a religious exemption.
Question presented
1. Does credible evidence regarding the Petitioners’ water use habits, topography and soil conditions surrounding plaintiffs’ residences, and the bacterial and viral composition of gray water, coupled with plaintiffs’ admission that the government has a compelling interest in protecting human health and the environment, satisfy RLUIPA’s requirement that the government demonstrate a compelling interest as applied to Petitioners? 2. Does a government satisfy RLUIPA’s “least restrictive means” test if it, in addition to providing scientific support for its own regulation, provides credible evidence demonstrating why a water-treatment system permitted in a minority of states is not suitable for use within its own state?
- Case path
Court of Appeals of Minnesota / Decision released Jul 2, 2021
- Area
Decided Supreme Court case
Briefing
What it's about
Swartzentruber Amish families in Minnesota say county septic and land-use rules pressure them to use modern technology in ways that conflict with their faith. The Supreme Court sent the case back to the Minnesota court for another look after Fulton v. Philadelphia, but it has not resolved the broader RLUIPA questions itself.
Vote
No oral argument on the current questions is scheduled. The Court previously vacated the Minnesota judgment and sent the case back for further consideration in light of Fulton v. Philadelphia.
“for further consideration in light of Fulton v. Philadelphia”
Impact
The case tests how strongly governments must justify refusing religious exemptions under RLUIPA, a federal religious-land-use law. That can affect families, churches, and other religious property owners seeking exceptions to health or environmental rules.
What's next
The next step is continued lower-court review applying Fulton and RLUIPA's strict test. There is no oral-argument date or decision window available now, so watch for new state-court action and any later return to the Supreme Court.
What is the core fight in Mast v. Fillmore County?
The Amish families say county septic and land-use rules force technology that violates their faith. The county says health and environmental protection justify the rules.
Why could this case matter beyond these Minnesota families?
A stricter reading of RLUIPA could help religious landowners seek more exemptions from local rules. Counties might need stronger evidence to deny those requests.
What is the next procedural step in Mast v. Fillmore County?
Lower courts must reconsider the case in light of Fulton v. Philadelphia. If the dispute continues, it could return to the Supreme Court later.
Decision
What the Court decided
This case asks how demanding RLUIPA is when a county denies a religious exemption from septic and land-use rules.
Impact
The case tests how strongly governments must justify refusing religious exemptions under RLUIPA, a federal religious-land-use law. That can affect families, churches, and other religious property owners seeking exceptions to health or environmental rules.
Not official Court text.
Opinion documents
Timing
Decided July 2, 2021
The Court released its decision on July 2, 2021 without hearing oral argument.
Documents
Related cases




Grounding
- Grounding
- Primary materials plus reporting.
- Note
- Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.
- Checked
- Jul 2, 2026
- Method
- Methodology
Primary materials8
Supreme Court docket 20-7028
docket | Jul 25, 2026
Primary case document
Supreme Court document | Jul 25, 2026
CourtListener docket record
docket | Jul 25, 2026
Opinion
opinion | Jul 2, 2021
Petition
brief | Jan 20, 2021
SupremeCourt.gov
official | Jul 2, 2026
SupremeCourt.gov
official | Jul 2, 2026
SupremeCourt.gov
official | Jul 2, 2026