Michigan Administrative Code Department - Environmental Quality
Here’s an enhanced overview of the Michigan Administrative Code (MAC) for the Department of Environmental Quality (DEQ)—now reorganized as Michigan’s EGLE (Environment, Great Lakes, and Energy):
🔹 Overview of MAC – Department of Environmental Quality
The Michigan Administrative Code establishes the DEQ’s rules, organized by division, covering air, water, waste, remediation, mineral, and land resources (en.wikipedia.org).
📂 Key Divisions & Selected Admin Code Sections
1. Air Quality Division (AQD)
Part 6: Emission limits/prohibitions (e.g. volatile organic compounds) (casetext.com)
Includes rules on testing/sampling under R 336.1201–1299 (ars.apps.lara.state.mi.us)
2. Drinking Water & Municipal Assistance
R 325.10101–12820: Standards for public water supplies and cross‑connection control (ars.apps.lara.state.mi.us)
R 560.401–428: Subdivisions of land—onsite water/sewage disposal (ars.apps.lara.state.mi.us)
3. Materials Management & Hazardous Waste
R 299.9101–11107: Hazardous waste management (updated May 2025) (ars.apps.lara.state.mi.us)
R 325.1541–1549: Medical waste handling by Office of Waste Management & Radiological Protection (law.cornell.edu)
4. Water Resources / Wetlands / Sewerage
R 281.xxxx: Shorelands, inland lakes, wetlands, dams, sewerage
5. Oil, Gas & Minerals
R 425.xxxx: Regulation of mineral and gas operations (ars.apps.lara.state.mi.us)
6. Remediation & Redevelopment
R 299.1–50: Environmental contamination response rules (ars.apps.lara.state.mi.us)
📌 Accessing the Rules
Official Michigan ARS site offers PDF/HTML for each part (e.g. R 336.1201–1299 for AQD) (ars.apps.lara.state.mi.us)
Justia/Cornell LII provides annotated listings by office/division (law.cornell.edu)
EGLE’s Guide to Environmental Regulations clarifies how these divisions correspond to regulatory obligations (michigan.gov)
🧭 Example: Medical Waste Rules
Located in R 325.1541–1549: Include definitions, packaging, treatment, registration, training, enforcement, record retention.
Governed by DEQ’s Office of Waste Management & Radiological Protection (law.cornell.edu)
🗂️ How to Navigate
Identify your area of interest: air, water, waste, minerals, land, etc.
Locate the relevant Code range (e.g., R 325.xx or R 336.xx) on EGLE’s ARS portal.
Review PDFs for detailed regulatory requirements and effective dates.
✅ Quick Reference Table
| Division | Code Range | Topics |
|---|---|---|
| Air Quality | R 336.1101–336.2199 | Emissions, approvals, testing |
| Drinking Water & Municipal | R 325.10101–12820, R 560.401–428 | Water supply, subdivisions |
| Materials Mgmt | R 299.9101–11107; R 325.1541–1549 | Hazardous & medical waste |
| Water Resources | R 281.xxx | Wetlands, dams, sewerage |
| Oil, Gas, Minerals | R 425.xxxx | Extraction operations |
| Remediation | R 299.1–50 | Contamination response |
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