Septic Contractor License Requirements by State
Installs and repairs onsite sewage treatment systems. Installer, business, pumping, and maintenance credentials vary by state. This page compares septic contractor licensing requirements across all 50 US states and the District of Columbia. Every row links to the verified state page with statute citations, fees, exam scope, insurance, and renewal rules.
- Published guides
- 51
- Exam pathways recorded
- 36
- Bond amounts recorded
- 7
- Local / scope-specific
- 10
Comparison table — all 51 jurisdictions
Scroll horizontally on smaller screens. Sort by state, recorded initial credential fee, or published bond amount. Experience pathways use different measures and cannot be ranked as years. Click any state to open the verified license page.
Local examples, voluntary programs, and business registrations are identified in the individual guides. A blank amount does not establish an exemption.
| State | License | Exam | Experience | Bond | Initial fee | Renewal | NASCLA | Time |
|---|---|---|---|---|---|---|---|---|
| Alabama State license | Basic / Advanced Level I / Advanced Level II installer | Required | Basic: 12 months, with specified credential waivers | — | — | 1 yr | — | Depends on the selected pathway |
| Alaska State license | Certified Installer with qualifying contractor license | Required | Training plus a qualifying contractor license | — | — | — | — | Depends on the selected pathway |
| Arizona State license | R-41 / C-41 / CR-41 Septic Tanks and Systems | Depends on pathway | R-41: three years of qualifying experience | — | — | — | — | Depends on the selected pathway |
| Arkansas State registration | Onsite wastewater installer registration | Required | Installer examination and registration | — | $100 | 1 yr | — | Depends on the selected pathway |
| California State license | C-42 Sanitation System contractor | Depends on pathway | Four qualifying years within the last ten, subject to approved credit | $25,000 | $200 | — | — | Depends on the selected pathway |
| Colorado Local / scope-specific | Local OWTS systems-contractor authorization | Depends on pathway | Local qualifications; Jefferson County application and test | — | — | — | — | Depends on the selected pathway |
| Connecticut State license | Subsurface sewage disposal system installer | Required | Four qualifying installations within five years | — | — | 1 yr | — | Depends on the selected pathway |
| Delaware State license | Class E onsite wastewater system contractor | Required | Class E application review and examination | — | $100 | 1 yr | — | Depends on the selected pathway |
| District of Columbia Mixed / scope-dependent | Work-specific plumbing and wastewater approvals | Confirm with authority | Work-specific plumbing qualifications | — | — | — | — | Depends on the selected pathway |
| Florida State registration | Florida Registered Septic Tank Contractor and Business Authorization | Required | Qualifying septic contracting experience, subject to statutory substitution limits. | — | $100 | 1 yr | — | Depends on training |
| Georgia State license | Georgia Septic Installer Certification and Installer Company Certification | Required | Residential examination and employment by a certified company. | — | $400 | 2 yr | — | Depends on training |
| Hawaii State license | C-43 sewer, sewage disposal, drain, and pipe laying | Required | Four supervisory years within the last ten | — | — | — | — | Depends on the selected pathway |
| Idaho Mixed / scope-dependent | Basic or complex septic installer registration | Required | Basic or complex category examination | $10,000 | — | 1 yr | — | Depends on the selected pathway |
| Illinois State license | Private sewage disposal system installation contractor | Required | Installation contractor examination | — | $100 | 1 yr | — | Depends on the selected pathway |
| Indiana Local / scope-specific | Local onsite sewage installer requirements | Depends on pathway | Local requirements; Porter County requires IOWPA certification | — | — | — | — | Depends on the selected pathway |
| Iowa Local / scope-specific | County private-sewage approvals | Confirm with authority | County installer and approved-design requirements | — | — | — | — | Depends on the selected pathway |
| Kansas Local / scope-specific | Local septic installer licensing | Depends on pathway | Local licensing; Johnson County workshop and test | — | — | — | — | Depends on the selected pathway |
| Kentucky State license | Certified onsite sewage disposal system installer | Depends on pathway | Tier-specific certification; master-plumber exceptions | — | $45 | 1 yr | — | Depends on the selected pathway |
| Louisiana State license | Basic / Combination onsite wastewater installer | Confirm with authority | Basic or Combination route; manufacturer endorsements where required | — | $100 | 1 yr | — | Depends on the selected pathway |
| Maine Local / scope-specific | Local permits and voluntary installer certification | Confirm with authority | Voluntary route: courses and two documented installations | — | — | 5 yr | — | Depends on the selected pathway |
| Maryland State registration | Onsite wastewater installer registration | Confirm with authority | Installer registration and technology-specific qualifications | — | — | — | — | Depends on the selected pathway |
| Massachusetts Local / scope-specific | Disposal System Installer’s Permit | Confirm with authority | Knowledge and experience demonstrated to the local authority | — | — | — | — | Depends on the selected pathway |
| Michigan Local / scope-specific | Local septic installer and construction requirements | Depends on pathway | Local requirements; Oakland County class and examination | — | — | — | — | Depends on the selected pathway |
| Minnesota State license | Minnesota SSTS Installation Business License and Installer Certification | Required | 15 installations, including above- and below-ground systems, plus observation of five pump-outs and disposal. | $25,000 | $200 | 1 yr | — | Depends on training |
| Mississippi State license | Certified onsite wastewater installer | Required | Installer training and examination | — | — | 1 yr | — | Depends on the selected pathway |
| Missouri State registration | Basic / Advanced onsite wastewater installer registration | Required | Basic course before Advanced; minimum age 18 | — | $0 | 3 yr | — | Depends on the selected pathway |
| Montana Local / scope-specific | Local septic installer registration | Confirm with authority | County-specific installer registration | — | — | — | — | Depends on the selected pathway |
| Nebraska State license | Journeyman / Master onsite installer certification | Required | Category examination; journeyman employment restrictions | — | $100 | 2 yr | — | Depends on the selected pathway |
| Nevada State license | C-27 Individual Sewerage contractor | Depends on pathway | Four qualifying years within the last fifteen | — | $600 | 2 yr | — | Depends on the selected pathway |
| New Hampshire State license | Septic system installer permit | Required | Competency examination and plan-reading ability | — | $80 | 2 yr | — | Depends on the selected pathway |
| New Jersey Mixed / scope-dependent | Local septic approvals and applicable contractor registration | Confirm with authority | Local installation and applicable business-registration requirements | — | — | — | — | Depends on the selected pathway |
| New Mexico Mixed / scope-dependent | Appropriate CID contractor classification | Confirm with authority | Qualifying CID classification for the proposed scope | — | — | — | — | Depends on the selected pathway |
| New York Local / scope-specific | Local septic contractor licensing and system approvals | Depends on pathway | Local requirements; Westchester instruction and examination | — | — | — | — | Depends on the selected pathway |
| North Carolina State license | North Carolina Grade Level II / IV Onsite Wastewater Contractor Certification | Required | Grade II: approved introductory education; Grade IV: two years holding satisfactory Grade II certification plus advanced education. | — | $0 | 1 yr | — | Depends on training |
| North Dakota State license | NDDEQ septic installer license | Confirm with authority | NDDEQ license; training currently recommended | — | $0 | — | — | Depends on the selected pathway |
| Ohio Mixed / scope-dependent | Local sewage treatment system contractor registration | Depends on pathway | Competency evidence under state rule; local registration | $40,000 | — | 1 yr | — | Depends on the selected pathway |
| Oklahoma State license | Installer-in-training / certified installer | Required | Training, examination, five installations and category inspections | $75,000 | — | 1 yr | — | Depends on the selected pathway |
| Oregon State license | Sewage Disposal Service business license and installer certification | Required | Certified supervisor plus SDS business licensing | $15,000 | — | 3 yr | — | Depends on the selected pathway |
| Pennsylvania Mixed / scope-dependent | Local sewage approvals and applicable HIC registration | Confirm with authority | Local sewage requirements and applicable HIC registration | — | $100 | 2 yr | — | Depends on the selected pathway |
| Rhode Island State license | OWTS installer license | Required | Written examination and level/transit demonstration | — | — | — | — | Depends on the selected pathway |
| South Carolina State license | Tier 1 / Tier 2 / Tier 3 onsite installer | Required | Tier-specific examination and experience | — | $100 | 1 yr | — | Depends on the selected pathway |
| South Dakota State license | Individual and Small On-Site Wastewater System Installer | Required | Plumbing Commission application and installer examination | — | — | — | — | Depends on the selected pathway |
| Tennessee State license | Septic system installer permit | Required | Examination and supervised installation | — | $200 | 1 yr | — | Depends on the selected pathway |
| Texas State license | Texas OSSF Installer I / Installer II | Required | Installer I: approved training; Installer II: qualifying license or apprenticeship experience. | — | $0 | 3 yr | — | Depends on training |
| Utah Mixed / scope-dependent | S410 contractor classification and local onsite approvals | Confirm with authority | Specialty contractor prelicensure route or approved alternative | — | — | — | — | Depends on the selected pathway |
| Vermont Mixed / scope-dependent | Wastewater permits and applicable residential contractor registration | No statewide exam | Approved design and applicable residential registration | — | — | — | — | Depends on the selected pathway |
| Virginia State license | Virginia Onsite Sewage System Installer — Conventional / Alternative, Journeyman / Master | Depends on pathway | Conventional journeyman: 3, 6, or 12 months depending on prior credentials and employer; master and alternative routes differ. | — | $0 | 2 yr | — | Depends on training |
| Washington Mixed / scope-dependent | Local installer approval and contractor registration | Confirm with authority | Local installer approval plus L&I business registration | $15,000 | — | — | — | Depends on the selected pathway |
| West Virginia State license | Class I / Class II sewage system installer certification | Required | Class I examination before Class II upgrade | — | $150 | 5 yr | — | Depends on the selected pathway |
| Wisconsin State license | Master Plumber or Master Plumber Restricted Service authority | Required | Restricted master: 1,000 hours per year for two licensed years | — | — | — | — | Depends on the selected pathway |
| Wyoming Local / scope-specific | Small wastewater construction approval | Confirm with authority | Requirements of DEQ or the delegated county authority | — | — | — | — | Depends on the selected pathway |
National picture for septic contractor
These 51 published guides describe different combinations of individual and business credentials. Examination requirements can depend on the grade or an approved exemption. Experience may be measured in installations, supervised months, training, or time holding an earlier credential. Read the specific pathway before comparing costs or planning an application.
The comparison above is generated at build time directly from the state license entries on this site. Every value is traceable to the regulator's published rule. If you spot a discrepancy, the state page is the source of truth and will be re-verified against the official source set.
Choosing where to license first
- Start with the work: identify the system type and whether you will install, pump, maintain, inspect, or design it.
- Identify both applicants: determine which approvals belong to you and which belong to your employer or business.
- Price the whole pathway: include training and testing alongside government charges. Unpriced costs and a blank bond field are not exemptions.
- Check transfer rules: read the state guide’s out-of-state pathway before relying on an existing credential.
Related trades
Scope of work overlaps at the edges of every classification. Contractors researching septic contractor licensing often also need the comparison hub for these adjacent trades:
Related reading
Original cross-state analyses from our dataset that add context to the septic contractor table above — who runs the exams, where the burden is heaviest, and what a criminal record means for eligibility.
The Contractor Licensing Atlas
What mapping 918 licenses revealed about exam providers, bonds, and where a trade needs no state license at all.
Contractor license difficulty index
Where each state ranks on exam, experience, and bond burden — hardest to easiest.
License costs ranked by state
Cheapest to most expensive states once fees, bond, and first-year insurance are counted.
Licensing with a criminal record
A 50-state look at background checks and which convictions actually block a license.
Data is sourced from the issuing boards' published rules. Latest completed source-check date represented in the dataset: 2026-09-30.