Why Flow Rate Is a Compliance Variable, Not a Spec Constant

For an airport project touching multiple states, the GPM rating on your faucet spec isn’t a fixed number, it’s a variable tied to jurisdiction. A faucet that passes federal EPAct review in Texas will fail California’s Title 20 requirements if installed as-is. The fix isn’t picking one number and hoping it clears every desk, it’s building a spec sheet that documents compliance at every tier a reviewer might check.

Federal Baseline: EPAct Caps Flow at 2.5 GPM

The federal baseline under the Energy Policy Act (EPAct) sets a maximum flow rate of 2.5 gallons per minute at 80 psi for lavatory faucets. This is the floor every state builds on, not the ceiling. Any faucet you put out for bid needs to show EPAct compliance as the baseline certification regardless of where the project sits, because federal funding sources and FAA grant assurances often reference EPAct directly in facility specifications.

If your procurement package only cites EPAct and stops there, you’re fine for projects in states that haven’t layered on their own standard. You are not fine in California, and you are not fine in the growing list of states that have adopted intermediate limits.

California’s Title 20: 1.8 GPM, No Exceptions

California Title 20 (California Code of Regulations) sets a maximum flow rate of 1.8 gpm for lavatory faucets, lower than the federal 2.5 gpm ceiling. This isn’t a recommendation, it’s an enforceable appliance efficiency regulation administered by the California Energy Commission, and fixtures sold or installed in the state must meet it regardless of what’s acceptable elsewhere in your contract.

For airport projects with any California terminal, concourse, or support facility scope, treat 1.8 gpm as the governing number for that location in your spec sheet, not an optional footnote. Reviewers checking CEC compliance will flag anything above that threshold, and a resubmission cycle on a terminal project timeline costs more than getting the spec right the first time.

Mid-Tier States Holding at 2.0 GPM

Several states have adopted a 2.0 gpm standard that sits between the federal baseline and California’s stricter limit. This tier matters for multi-state contracts because it means you can’t default to “federal everywhere except California.” You need a three-tier flow rate matrix, not a two-tier one.

States in this middle tier vary in how they codify the limit, some through state energy codes, others through plumbing code amendments. The practical effect is the same: a 2.5 gpm faucet that’s federally compliant will fail state-level inspection in these jurisdictions even though it would pass federal review. Your spec sheet needs to flag this tier explicitly rather than let it get lost between the two extremes everyone already knows about.

Flow Rate Requirements by Tier

Building One Spec Sheet That Covers All Three Tiers

The procurement problem isn’t technical, it’s documentation structure. Reissuing bid packages per state wastes review cycles and invites inconsistency between submittals. The better approach is a single spec sheet that lists the fixture’s flow rate capability across all three tiers up front, with the aerator or flow restrictor part number that achieves each rate.

Most commercial faucet bodies accept interchangeable aerators or flow control inserts, so the base fixture doesn’t change across jurisdictions, only the restrictor does. Build your spec sheet to show:

• Base faucet model number and body certification (EPAct baseline)
• Aerator part number for 2.5 gpm (federal default)
• Aerator part number for 2.0 gpm (mid-tier states)
• Aerator part number for 1.8 gpm (California Title 20)
• Thread size confirmation for aerator compatibility across all three ratings

That last point is where procurement packages most often fall apart. Aerator thread sizing has to stay consistent across flow-rate changes, or a field crew ends up with a 1.8 gpm restrictor that won’t thread into a faucet spigot spec’d for the 2.5 gpm version. Confirm thread compatibility (most commercial lavatory faucets use a standard aerator thread, but verify against the manufacturer’s cut sheet rather than assuming) before the spec sheet goes out for bid. This same cross-compatibility question comes up in terminal crew-rest areas and employee locker rooms where you’re specifying rain shower heads alongside lavatory faucets, since those fixtures carry their own flow caps and thread standards that need the same tiered treatment.

Documenting Flow Rate for Multi-State Airport Contracts

For a project with facilities in California, a mid-tier state, and a federal-baseline state, your documentation package needs three things reviewers will ask for independently: the EPAct compliance certificate for the base fixture, the CEC listing or Title 20 compliance documentation for any California-bound units, and a cut sheet showing the mid-tier aerator configuration with its tested flow rate.

Keep these as separate attachments referenced by location in your master spec, not buried in a single combined certificate. A reviewer checking California compliance doesn’t want to parse a document that also covers Texas. Label each attachment by jurisdiction and flow rate so an auditor or inspector can find the relevant page without reading the whole package.

If your contract includes a facilities management handoff, include the aerator replacement part numbers in the O&M manual, not just the bid documents. Maintenance staff swapping aerators five years out need the same tiered information you used at procurement, and they won’t have access to the original bid package.

Next Steps Before You Issue the Bid Package

Before finalizing a multi-state spec sheet, confirm three things directly against the manufacturer’s current cut sheets rather than relying on memory or a prior project’s documentation: the exact flow rate tested for each aerator configuration, the aerator thread standard for the specific faucet body you’re specifying, and whether the state in question has updated its flow rate standard since your last project there. State-level appliance efficiency standards do get revised, and a mid-tier state holding 2.0 gpm today is not guaranteed to hold that number on your next contract cycle. Pull current documentation at the start of each procurement cycle rather than copying forward a spec sheet that was accurate two years ago.