Regional and Shared Compost Facilities and How Cities Partner

Cities and counties share a compost facility when none of them has enough tonnage, a suitable site or the staff to run one alone. The usual legal vehicles are a joint powers authority or other separate public entity, an interlocal agreement without a new entity, or a contract under which one agency hosts the facility and the others deliver material. The project succeeds or fails on four sets of terms: who governs, who pays and how, what the host community receives, and what tonnage each member commits.

Key takeaways

A shared facility spreads fixed costs (site, permits, equipment, staff, compliance) over more tons, and gives a region one permitted site instead of several marginal ones.
Pick the legal structure first. A separate entity can own property, borrow and contract in its own name; a simple agreement leaves those powers with the members.
Host community terms (traffic routes, hours, complaint response, compost access, compensation) belong in the founding agreement, not in a later side letter.
Tonnage commitments make the facility financeable but limit members’ freedom. Flow control to a public facility and to a private one are treated differently in US constitutional law, so get counsel involved early.
In California, SB 1383 duties delegated to a joint powers authority are treated differently from duties delegated to other entities, according to CalRecycle.

Why regionalize

The economics of a compost facility are lumpy. A permit, a scale house, a loader, a screen, a trained operator and an emissions control approach cost roughly the same whether the site takes a modest or a large tonnage. Sharing them helps in several ways:

Scale. One site at a workable size instead of several undersized ones.
Siting. Only one community has to host it, and the partners can choose the site with the best buffers, power and access.
Staff. One trained crew instead of several part-time ones. See the staffing and operator training guide.
Capacity planning. In California, CalRecycle’s capacity planning page says counties must collect capacity information from each jurisdiction in the county and report to CalRecycle, and jurisdictions must identify verifiably available capacity both inside and outside the county. A shared facility is one way to show that capacity.

The costs are also real: longer hauls for some members, slower decisions, and a host community that may feel it carries the burden for everyone.

Legal structures for a shared facility

Each state sets its own rules. California and Washington are shown here as examples because their statutes are short and clear; check your own state’s law.

Joint powers authority (separate entity)

Under California Government Code section 6502, two or more public agencies, if authorized by their governing bodies, may by agreement jointly exercise any power common to them. Section 6507 makes the agency created by the agreement a public entity separate from its members, and section 6508 lets it, where the agreement authorizes, make contracts, employ staff, build and operate works, hold property and incur debts in its own name. Under section 6503.5, a separate agency must file a notice of the agreement with the Secretary of State within 30 days, and if it fails to file it cannot issue bonds or incur debt until it does.

Interlocal agreement (with or without a new entity)

Washington’s Interlocal Cooperation Act, RCW 39.34.030, lets two or more public agencies agree to joint or cooperative action after each governing body acts by ordinance or resolution. The agreement must state its duration, any separate entity and its powers, its purpose, how it is financed and budgeted, how it can be terminated and how property is disposed of. If no separate entity is created, the agreement must also name an administrator or joint board and say how property is acquired, held and disposed of.

Host agency contract

One city or county owns and runs the facility; the others sign delivery contracts. This is the simplest structure and the fastest to set up. Partners get less say in governance, and the host carries the permit and the capital.

Regional government

Some regions already have a government that handles solid waste for its members. SG’s Grand Forks profile describes the Regional District of Kootenay Boundary in British Columbia composting yard and garden waste at the Grand Forks Landfill, adding residential food waste as a result of an expanded regional organics diversion program, and later adding biosolids, with plans for two separate Class A products (profile).

Structure	Owns property and borrows in own name	Speed to set up	Member control	Fits when
Joint powers authority or similar entity	Yes, if the agreement allows	Slowest	Board seats by formula	Several members, long horizon, debt financing
Interlocal agreement, no new entity	No; a member or joint board acts	Medium	Joint board or lead agency	Few members, simple sharing
Host agency contract	Host only	Fastest	Host decides; others by contract	One member has the site and the will
Existing regional government	Yes	Already exists	Through the regional board	The region already runs solid waste

Governance and cost sharing

Write these decisions into the founding agreement:

Board seats and voting. Equal votes, votes weighted by tonnage or population, or a mix. Some decisions (debt, adding members, choosing a site) may need a supermajority.
Capital contributions. Shares fixed at formation, or set by each member’s committed tonnage.
Operating cost recovery. A common pattern is a fixed share for each member to cover debt and standing costs, plus a per-ton charge for material delivered. Write it as a formula with named variables (fixed share F for each member, per-ton rate R, tons delivered T) so the board can update rates each year without renegotiating.
Third-party tonnage. Whether private haulers and non-member agencies may tip, at what rate, and who keeps the revenue.
Compost. Who gets product first, at what price, and how it counts toward members’ purchasing duties. In California, SB 1383 requires cities and counties to procure a quantity of recovered organic waste products each year against a population-based target (CalRecycle procurement).
Withdrawal and new members. Notice periods, the departing member’s share of outstanding debt, and the buy-in terms for a member that joins later.

Host community terms

The host community accepts trucks, noise and the risk of odor complaints for the whole region. Spell out what it receives and what protects it:

[ ] Haul routes and hours, with limits on queueing on public roads
[ ] A named contact for complaints and a published response time
[ ] Odor management plan and complaint log shared with the host at set intervals
[ ] Priority access to finished compost for residents and city departments
[ ] Any host fee or in-kind benefit, stated as a formula, not a promise
[ ] Limits on feedstock types and on future expansion without host consent
[ ] Site tours and an annual public report
[ ] What happens at closure: site restoration and who pays

The odor management guide and the community relations guide cover the operating side. Technology choice matters here too. Covered aerated static pile composting with a GORE® Cover is designed to contain odors at the pile, though receiving, mixing and screening still need their own controls.

Tonnage commitments and flow control

Lenders and operators want to know the tons will arrive. Members want the freedom to send material elsewhere if it is cheaper. The founding agreement has to settle this.

Commitments in the agreement. Common tools are minimum annual tonnage per member, a “put or pay” charge if a member delivers less, or a share of fixed costs that each member pays regardless of tons. Set a range rather than a single number, and allow for program ramp-up. The tonnage forecasting guide shows how to build that range.

Flow control ordinances. Some agencies require haulers to deliver waste collected in their area to a designated facility. The US Supreme Court struck down an ordinance that directed waste to a privately operated transfer station in C & A Carbone v. Clarkstown (1994). In United Haulers Ass’n v. Oneida-Herkimer Solid Waste Management Authority (2007), it upheld ordinances that required haulers to deliver to facilities owned by a public authority, holding that they do not discriminate against interstate commerce because they treat in-state and out-of-state private businesses the same. The line between public and private facilities matters for a regional project that might use a private operator. State law adds its own limits, so take this question to counsel before you draft.

SB 1383 and shared duties in California

CalRecycle’s enforcement questions and answers on designees say a jurisdiction can designate SB 1383 responsibilities through contracts with haulers or other private entities, or through agreements with other jurisdictions, regional agencies (as defined in Public Resources Code section 40181) or other government agencies. A jurisdiction cannot give a private entity the authority to issue waivers or impose civil penalties. CalRecycle adds that when a jurisdiction delegates responsibilities, except to a joint powers authority, it is still ultimately responsible for compliance, and that a single JPA employee can be the primary contact for members using a JPA to comply. Read the current guidance before relying on it; as of October 2026 these are CalRecycle’s published answers. The list of key SB 1383 requirements summarizes the wider duties.

Fits when, does not fit when

A shared facility fits when:

no member has enough tonnage for a well-used facility on its own
one site in the region is clearly better (buffers, power, access, existing permits)
members can agree on governance and a cost formula they will keep for many years
the haul from the farthest member is acceptable in time and fuel

It does not fit when:

haul distances make transfer stations a hidden second project
one member will carry nearly all the impact and gets little in return
members’ collection programs are on very different schedules and cannot commit tonnage
a nearby private facility already offers secure capacity on acceptable terms

Forming a regional project: steps

Convene staff from interested agencies and agree on a shared tonnage range and feedstock mix.
Screen candidate sites against the same criteria and pick a preferred site with the host agency’s informal support.
Choose the legal structure and draft the founding agreement with counsel from each member.
Settle host community terms with the host agency and its residents before any board votes.
Run a pilot on the preferred site with members’ actual feedstock. SG’s pilots and demos page describes pilots that run actual batches to generate data for permits, grants or board approval.
Decide the operating model (see the operating models guide) and the procurement route.
Take the agreement to each governing body, then file whatever notice your state requires.

For the facility itself, Sustainable Generation lists feasibility studies, site selection, financial and technical evaluation, grant support and RFP assistance among its project initiation services, and offers permitting and engineering support. Its pages describe SG as a system supplier and adviser, not as an operator.

FAQ

What is the difference between a joint powers authority and an interlocal agreement?

The terms vary by state. In general, a joint powers authority is a separate public entity created by agreement that can contract, hold property and often borrow in its own name. An interlocal agreement can create such an entity or simply set out how members cooperate, with a lead agency or joint board acting for them. Your state’s statute controls which forms are available.

Can a regional facility accept material from private haulers?

Usually yes, if the founding agreement and the permit allow it. Third-party tons can lower the per-ton cost for members, but they also use capacity members may need later. Set a policy on priority, rates, contamination limits and how revenue is shared before the facility opens.

How do members share costs fairly when tonnage changes?

Split costs into fixed and variable parts. Fixed costs, such as debt service and standing staff, are divided by an agreed share. Variable costs are recovered through a per-ton charge on actual deliveries. Review the shares on a set schedule, and write the formula into the agreement so updates do not need a full renegotiation.

Does joining a JPA end a California city’s SB 1383 responsibility?

Not automatically. CalRecycle’s published answers say a jurisdiction that delegates responsibilities to other entities remains ultimately responsible, and they make an exception for responsibilities delegated to a joint powers authority. How much transfers depends on the agreement and the current regulations, so confirm with CalRecycle and counsel.

Next step

If your agencies are screening sites or testing whether a shared facility works, ask SG about consulting support for feasibility and site work, or plan a pilot on the preferred site with members’ actual feedstock.

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