Last updated 2026-08-21
TL;DR
Get paid to install drainage tile in Hawaii, and you need a contractor license once the job clears $1,000, or you advertise as a contractor, or a building permit is required. Classification A names drainage in statute. C-43 and C-17 cover most trench and pipe work. County grading, SMA, 811, and water-law paper sit on top. Confirm current fees and forms with the Contractors License Board.
Do you need a license for drainage tile in Hawaii?
Yes. Paid drainage tile work in Hawaii is contracting under HRS chapter 444 once the aggregate price for labor, materials, taxes, and other items is more than $1,000, or whenever a building permit is required, or if you advertise as a contractor.[1][2]
The statute is blunt. HRS 444-9 says: "No person within the purview of this chapter shall act, or assume to act, or advertise, as general engineering contractor, general building contractor, or specialty contractor without a license previously obtained under and in compliance with this chapter and the rules and regulations of the contractors license board."[1]
People get this wrong because they think farm drainage is somehow off the books. Owner work on your own property has a limited exemption if you are not in the construction business.[2] That is not you if you bid other people's fields or sell installation as a trade.
The $1,000 figure is an aggregate. Pipe plus ocean freight plus excavator time plus tax. Hawaii freight alone can blow through that number on a short lateral. HRS 444-2 sets a $1,000 aggregate contract-price ceiling on the small-project exemption, and that exemption does not apply when a building permit is required.[2]
I would not put "tile drainage" on a door, a truck, or an ad until the card is in hand. Advertising as a contractor without a license is its own problem under the same chapter.
Unlicensed contracting can mean citations, civil fines, and a fight over whether you can even collect. Confirm current enforcement with DCCA RICO and the Contractors License Board. I am not going to invent a fine schedule.
If you only sell pipe and never install it, you may sit outside chapter 444 as a materials seller.[2] The minute you trench, set grade, or fuse a main, you are in the work.
Which contractor classification covers drainage tile in Hawaii?
The statute names drainage under the A general engineering contractor. Many field jobs also fit C-43 (sewer, sewage disposal, drain, and pipe laying) and C-17 (excavating, grading, and trenching). Which one you need depends on the scope you actually bid. Confirm the current list with the board.[3][4]
HRS 444-7 describes a general engineering contractor as one whose principal business is fixed works requiring specialized engineering knowledge and skill, "including the following divisions or subjects: irrigation, drainage, water power, water supply, flood control."[3]
That is the cleanest statutory hook for agricultural tile and outlet works.
A specialty C license only lets you work inside that specialty.[4] If the job is a long main, laterals, a pump vault, and a graded outlet ditch, one C class may not cover the stack. People try to stretch C-17 across pipe laying. I would not. Ask the board in writing which class they want for perforated agricultural drain and outlets.
C-37 plumbing is the wrong default. A house lateral and a field main are not the same trade, even if both move water in a pipe.
| Class | What the statute or list points at | When I'd consider it |
|---|---|---|
| A general engineering | Irrigation, drainage, flood control, earthwork | Mixed civil scope, larger systems |
| C-43 drain and pipe laying | Drain and sewer pipe | Pipe-focused laterals and mains |
| C-17 excavating and trenching | Cuts, fills, trenches | Earthwork only, not the full pipe stack |
Already hold a card in another state? Hawaii does not treat that as a free pass. Reciprocity is a board question, not a blog claim. For how other states write the same problem, see drainage tile license in California and drainage tile license in Arizona.
Do not assume you need A for a two-acre coffee block. Do not assume C-17 is enough for a pumped main either.
What does the Hawaii Contractors License Board actually require?
You apply through the Department of Commerce and Consumer Affairs, Professional and Vocational Licensing, Contractors License Board. You need the right classification, a responsible managing employee who can show the experience the rules ask for, passing exam scores, and the bond, insurance, and tax paper the board currently lists. Fees change. Confirm them on the current application packet.[5][6]
I am not going to invent an application fee or a typical approval clock. Those numbers rot. The board publishes forms. Use those.
The RME is the person whose experience and exam carry the license. If that person leaves, the entity has a problem. Read the current HAR chapter 16-77 rules on RME departure.[6]
Experience is documented, not vibed. Expect names of employers or projects the board can check. Secondary writeups and the long-standing HAR 16-77 pattern point at several years of supervisory time inside a lookback window. Treat that as a starting point and read the current rule text. Rules get amended.[6]
Exams are trade plus business and law. The board or its testing vendor publishes the bulletin. Study that bulletin, not a group chat summary.
HRS 444-11 is the application statute. It tells the board to look at experience, knowledge of state building and safety law, and the administrative side of contracting.[5] Financials and a surety bond or the equivalent show up in the packet. So does workers' compensation if you have employees.[7]
A corporation, LLC, or partnership needs its own entity registration plus the contractor license. The GET number from Taxation is separate.[8]
Want a paper checklist before you touch PVL forms? DrainageTilePath publishes a one-time Grade + GPS Plow + Outlet Kit at /start. It does not replace the board.
How much does a drainage tile license cost in Hawaii?
There is no honest single price I can print. Application fees, license fees, recovery fund contributions, exam fees, bond premium, and insurance all move. Confirm every dollar with the Contractors License Board and your insurer. Do not budget off a blog.
HRS chapter 444 creates a contractors recovery fund. You will see it in the statute and on the application.[9] The dollar amount assessed is a board and form fact. I will not guess it.
The expensive part is rarely the state's filing fee. It is the year you spend documenting experience, sitting exams, carrying a bond, and paying a broker for general liability plus equipment cover on a machine that had to be shipped to Honolulu or Hilo.
GET sits on your gross receipts at the state rate of 4 percent, plus whatever county surcharge applies where you work.[8] Counties have added surcharges at different times. Confirm the current combined rate for each island you invoice with the Department of Taxation.
If someone quotes a packaged Hawaii contractor license with a guaranteed date, walk away. Guarantees on board action are a tell.
Remote-state comparisons help only on process shape, not on price. Drainage tile license in Alaska is another place where freight and board paper dwarf the filing fee.
How much does drainage tile cost in Hawaii?
Nobody publishes a clean, current Hawaii per-foot drainage tile bid index. Midwest extension budgets do not transfer. Freight on dual-wall PE, volcanic rock, island labor, and interisland barge time dominate. Price the job from quotes, not from Iowa.
NRCS writes the national technical standard for subsurface drains as Conservation Practice Standard 606.[10] That document is about how a drain should function, not what a Maui contractor should charge.
On the mainland, university budgets in recent years have often landed somewhere around one to a few dollars per foot for laterals, with a wide spread for depth, spacing, and outlets. I am not going to recycle a Corn Belt number as if it were a Hilo price. Nobody has good public Hawaii tile-cost data. The closest official design text is still 606, and it is silent on island freight.[10]
Hawaii-specific cost drivers I would actually put in a bid: ocean freight and neighbor-island barge for pipe and a machine, rock that is a'a or pahoehoe instead of glacial till, the legal status of the outlet, and mobilization between districts that are not a Midwest county hop. Import envelope material if the native soil is wrong for the pipe.
If the landowner wants cost-share, ask NRCS Hawaii whether any drainage-related practice is even in the current EQIP schedule for that county. Do not promise EQIP money. Practice lists change by year and ranking pool.[10]
A small residential French drain on Oahu is a different market than agricultural laterals. Do not use one to price the other.
I'd rather lose a bid than guess rock without a test pit.
How long does drainage tile take in Hawaii?
The trench day is not the long pole. License paper, county grading or SMA review, 811 locates, and shipping the pipe often take longer than the install. A small, already-cleared field job can still be days of machine time once you are on grade. I will not quote a board processing time.
HRS 269E-7 requires notice to the one-call center at least five working days, but not more than twenty-eight calendar days, before non-emergency excavation.[11] That is longer than the two-day habit a lot of mainland operators bring with them.
Machine time depends on rock, water, and access. A clean alluvial patch is one story. A windward field with a high water table and basalt float is another. Nobody has a public Hawaii tile-crew productivity study I trust.
Need a Stream Channel Alteration Permit, an SMA decision, or an NPDES notice? Put those on the critical path before you book a barge for the plow.[12][13][14]
Weather is not a footnote. Hawaii rainfall is local and violent. Windward trenches fill. Schedule outlets and surface restoration like you mean it.
First-year operations for a new licensee are mostly paper, insurance, and one or two carefully chosen jobs. There is no Midwest winter circuit here anyway.
What permits sit on top of the contractor license?
A contractor license is not a grading permit, not an SMA permit, not a water-code permit, and not an NPDES. County public works and planning, DLNR, DOH Clean Water Branch, and sometimes the Corps all have their own triggers. Check the parcel before you bid.
Building permits are county. Honolulu, Hawaii County, Maui County, and Kauai County do not share one counter. Agricultural land can still need grading, grubbing, or stockpiling approval when you cut a main and spoil a berm.
Disturb one acre or more, and Hawaii's Clean Water Branch construction stormwater rules in HAR chapter 11-55 are in play.[14] Under an acre is not a free pass to push sediment into a stream. Confirm the current NGPC and acreage language with DOH CWB for your site.
Special Management Area rules under HRS chapter 205A catch a surprising amount of coastal and near-coastal farm land.[13] SMA is county-administered. I have seen people treat ag as exempt and then meet a planner. Ask planning, in writing, whether the trench and outlet are SMA development.
Conservation district land is a DLNR Office of Conservation and Coastal Lands problem, not a county one. Different map, different application.
Do not confuse this with how to start drainage tile in California. California has its own water board path. Hawaii's mix is SMA plus water code plus county grading.
Do you need 811 locates before you trench in Hawaii?
Yes. Before you excavate you notify the Hawaii one-call center under HRS chapter 269E. The statute sets a five working day minimum and a twenty-eight calendar day maximum for non-emergency notice.[11]
HRS 269E-7 requires notice to the one-call center at least five working days before non-emergency excavation.[11] Read the section. The five-day clock is a Hawaii-specific way to get in trouble if you fly a crew in on Monday and cut on Tuesday.
Fiber, military, county sewer, and private irrigation are all in the ground in places that look like open field. Old cane and pineapple land has abandoned lines. So does homestead land.
OSHA still owns the trench. 29 CFR 1926.651 sets the excavation rules on sloping, shoring, access, and water.[15] A tile trench is still a trench. Depth and soil type decide whether you need protection. Volcanic soils do not get a tropical exemption from cave-in physics.
Work around a live irrigation system, and lockout and locate are part of the job, not extras.
What about agricultural land, SMA, and Hawaii water law?
Field tile that lowers a water table or dumps to a ditch, gulch, or stream can trigger the State Water Code and wetland rules even when the county shrugs. HRS chapter 174C is the starting point for stream channel work.[12] SMA review under 205A can apply on the same parcel.[13]
A Stream Channel Alteration Permit from the Commission on Water Resource Management is the form people forget. If your outlet changes a stream channel, do more than cut the bank.[12]
Wetlands, including some taro systems and coastal flats, can pull in the U.S. Army Corps of Engineers under section 404 of the Clean Water Act. I am not mapping your field from here. Use a wetland specialist when the soils or plants look hydric. UH CTAHR's Hawaii Soil Atlas is a decent first look at poorly drained series, not a permit.[16]
Traditional and customary Native Hawaiian gathering and water practices are not a mainland drainage easement problem. If you are on or near kalo land or an old auwai, stop and get local counsel. This is where a copied Iowa plan becomes an expensive fight.
NRCS 606 still talks about regulating a water table for crops.[10] That purpose has to live inside Hawaii water law, not on top of it.
What insurance, GET, and first-year paper do you actually need?
Plan on general liability, workers' compensation if you have employees, a GET license, unemployment insurance, and whatever auto and equipment cover your lender or bond producer demands. HRS chapter 386 is the workers' compensation statute.[7] HRS chapter 237 is GET.[8]
Workers' compensation in Hawaii is not optional because the crew is family if they are actually employees. Misclassification is how first-year operators meet the Disability Compensation Division.
Hawaii GET on contracting is 4 percent at the state level under HRS chapter 237, before any county surcharge.[8] You file periodic Form G-45 returns. Build GET into the bid. Absorbing it to look cheaper is how you work for free.
No employees and you are the RME running a rented excavator? You still need the contractor license once you cross the chapter 444 triggers. The license and the tax license are different counters.
Keep a job file. Written contract, 811 ticket, site photos, grade notes, outlet location, and the county or DLNR correspondence. When a complaint hits DCCA, paper is what you have.
For a parallel first-year paper path in another state, how to start drainage tile in Alaska is a useful contrast on remote logistics. Drainage tile license in Alabama shows a different board culture.
What would I actually do if I were starting drainage tile in Hawaii?
I would pick one island, one classification theory, and one county planning counter, then I would confirm the class in writing with PVL before I bought a machine. I would not import a Midwest plow first.
Talk to the Contractors License Board about A versus C-43 versus C-17 for the exact scope. Get the current application and HAR 16-77.[5][6] Pull Web Soil Survey and the CTAHR Soil Atlas on the first target fields.[16] Ask county planning whether SMA or grading is in play. Ask CWRM whether the outlet needs a stream permit.[12] Price freight for pipe and a machine before you promise a per-foot number. Sit the exams. Set the entity, GET, bond, and insurance. Run 811 on a tiny job and prove your grade control.
I would not chase every island in year one. Interisland mobilization will eat a small book of work.
I would not install a gravity outlet into a gulch because that is how the last guy did it.
If the only work you can find is residential yard drains, that is a different bid and maybe a different class. Stay in your lane until the board says otherwise.
Waste of money: a full GPS plow package sitting in a container in Honolulu while your RME application is incomplete. Also a waste: paying a license mill that cannot tell you whether C-43 covers agricultural perforated pipe.
Want another state's start sequence for comparison only? How to start drainage tile in Arizona and how to start drainage tile in Colorado show drier hydrology and different boards.
What mistakes waste the most money on drainage tile Hawaii jobs?
The expensive mistakes are paper and rock, not the wrong corrugation stamp. Unlicensed contracting, a bad outlet, and a trench in the SMA without asking are the ones that blow up.
Copying Corn Belt spacing onto Hawaiian soils is a design error. Poorly drained coastal clays and free-draining lava are not the same profile. Use 606 as a technical reference and then design for the actual soil.[10][16]
Assuming farm work is exempt from HRS 444 is how people meet RICO. It is not exempt once you are in the business and over the statutory triggers.[1][2]
Calling in 811 on mainland timing fails here. Five working days.[11]
Skipping OSHA trench protection because it is only a tile saw still fails 1926.651.[15]
Bidding a statewide price from an Oahu yard is how you fund someone else's barge.
Treating this site as your lawyer is a mistake too. DrainageTilePath is an independent publisher, not a law firm and not a service company. Confirm every fee, form, and classification with the board. If you want a structured kit after you have read the statutes yourself, the $179 Grade + GPS Plow + Outlet Kit is at /start. The statutes still win.
Frequently asked questions
Do you need a license for drainage tile in Hawaii?
Yes for almost any paid install. HRS chapter 444 requires a contractor license if the aggregate job is more than $1,000, if a building permit is required, or if you advertise as a contractor. Owner work on your own land has a narrow exemption if you are not in the construction business. Confirm your facts with the Contractors License Board.
How much does drainage tile cost in Hawaii?
There is no public Hawaii per-foot index I trust. Midwest budgets of roughly one to a few dollars per foot do not include ocean freight, barge hops, or volcanic rock. Price pipe, mobilization, rock, and a legal outlet from current quotes. Ask NRCS Hawaii about any current cost-share practice. Do not promise a number from an Iowa spreadsheet.
How long does drainage tile take in Hawaii?
Machine time on a small, already-cleared field can be days once you are on grade. License paper, SMA or grading review, five working days for 811, and shipping often take longer than the trench. I will not quote board processing time. Put permits and freight on the calendar before you promise a start date.
Is agricultural drainage tile exempt from Hawaii contractor licensing?
Not if you are in the business of installing it. The owner-builder style exemption is for a person working on their own property who is not in the construction business. Bidding other farms, advertising, or crossing the $1,000 aggregate (or any job that needs a building permit) puts you inside HRS chapter 444. Ask PVL, not a neighbor.
What is a C-43 license in Hawaii and does it cover field tile?
C-43 is the specialty class for sewer, sewage disposal, drain, and pipe laying. It is the specialty people look at for drain pipe. Whether it covers your exact agricultural perforated main, pump vault, and outlet ditch is a board call. I would ask PVL in writing and not stretch C-17 across the pipe work.
Does a general engineering A license cover drainage in Hawaii?
HRS 444-7 lists drainage, irrigation, and flood control among the subjects of general engineering contracting. A is the broadest statutory match. It is also the heavier exam and experience lift. You may not need A for a small pipe-only job. Confirm classification against the scope you will actually bid.
Do I need an SMA permit to install field tile in Hawaii?
Maybe. Special Management Area rules under HRS chapter 205A are county-administered and catch a lot of coastal and near-coastal farm land. Ag use is not a blanket pass. Ask the county planning department in writing whether the trench, spoil, and outlet count as SMA development on that parcel before you bid.
How many days before digging do I call 811 in Hawaii?
HRS 269E-7 requires notice to the one-call center at least five working days, and not more than twenty-eight calendar days, before non-emergency excavation. That is not the two-day habit many mainland crews use. Emergency rules are narrower. Read the statute and keep the ticket with the job file.
Can I use an out-of-state contractor license for drainage tile in Hawaii?
No as a free pass. Hawaii licenses contractors under HRS chapter 444 through its own board, exams, RME rules, and bond paper. Any endorsement, waiver, or reciprocity path is a current board question. Do not advertise or bid Hawaii work on another state's card while you wait.
Do I need a GET license to install drainage tile in Hawaii?
If you are doing business here, you need a Department of Taxation GET license in addition to the contractor license. They are different counters. Contracting receipts generally sit in the 4 percent state GET bucket before any county surcharge. Confirm the current combined rate for each island you invoice, and file the periodic G-45 returns.
Can a landowner install their own drainage tile without a Hawaii contractor license?
Possibly, if the work is on property they own or lease and they are not in the construction business, which is the style of exemption in HRS 444-2. The $1,000 ceiling and the building-permit rule still matter if they hire someone. A hired installer who is in the trade needs the license. Confirm the fact pattern with the board.
Does NRCS Conservation Practice Standard 606 apply in Hawaii?
606 is the national technical standard for subsurface drains. Hawaii NRCS uses the national handbook when a subsurface drain is in a conservation plan. It is a design reference, not a contractor license and not a price list. Whether EQIP will pay for 606 on a given island and year is a separate, current NRCS Hawaii question.
Do I need workers compensation for a two-person drainage tile crew in Hawaii?
If they are employees, HRS chapter 386 is in play. Calling people family or 1099 does not settle the question. Hawaii is strict on coverage. Confirm status with the Disability Compensation Division and your carrier before the first trench. A two-person crew on a rented excavator is still a crew.
Is a yard French drain the same Hawaii license as agricultural tile?
Not automatically. Both move water in a trench, but scope, classification, and permits diverge. A house yard drain may pull plumbing or a different specialty, plus a building permit. Field laterals sit closer to C-43, C-17, or A, plus grading, SMA, and water-code questions. Ask the board about the exact scope. Do not price one from the other.
Sources
- Hawaii Revised Statutes §444-9 Licenses required: No person may act, assume to act, or advertise as a general engineering, general building, or specialty contractor without a Hawaii contractor license.
- Hawaii Revised Statutes §444-2 Exemptions: Chapter 444 includes a small-project exemption when the aggregate contract price is not more than $1,000, and that exemption does not apply when a building permit is required or the person advertises as a contractor.
- Hawaii Revised Statutes §444-7 Classification: A general engineering contractor's work includes fixed works such as irrigation, drainage, water supply, and flood control.
- Hawaii Revised Statutes §444-8 Titles of classifications; limitations: Specialty contractors are limited to the classification in which they are licensed.
- Hawaii Revised Statutes §444-11 Application; fees: Applicants must show the experience and knowledge of state contracting, building, and safety law that the Contractors License Board requires.
- Hawaii Revised Statutes §386-3 Injuries covered: HRS chapter 386 is Hawaii's workers' compensation coverage statute for employees.
- Hawaii Revised Statutes §237-13 Imposition of tax: Hawaii general excise tax on contracting activity is imposed at the 4 percent state rate under HRS 237-13, before any county surcharge.
- Hawaii Revised Statutes §444-26 Contractors recovery fund: HRS 444-26 establishes the contractors recovery fund that appears on Hawaii contractor applications.
- Hawaii Revised Statutes §269E-7 Inquiry to center required: An excavator must notify the one-call center at least five working days and not more than twenty-eight calendar days before non-emergency excavation.
- Hawaii Revised Statutes §174C-71 Protection of instream uses: The State Water Code directs a program to protect instream uses, including regulation of stream channel alterations.
- Hawaii Revised Statutes §205A-22 Definitions (Coastal Zone Management): HRS 205A defines Special Management Area and development for county SMA review of work in coastal zones.
- OSHA 29 CFR 1926.651 Specific excavation requirements: Federal OSHA excavation rules require protective systems, access, and water control in trenches based on depth and conditions.
- OSHA 29 CFR 1926.652 Requirements for protective systems: OSHA requires cave-in protection through sloping, shoring, or shielding for trenches based on depth and soil type.
- USDA NRCS Web Soil Survey: Web Soil Survey provides mapped soil series and drainage class data used to identify poorly drained soils on Hawaii parcels.