Washington Utility Connection Costs (2026): Tap Fees by City

Last reviewed: September 25, 2026By Utility Cost Guide editor

Washington’s three largest utilities in our database charge very different amounts to connect a new single-family home in 2026, and the totals aren’t fully apples-to-apples because each city publishes a different piece of the number. Spokane’s published general facilities charges (GFCs) plus permits come to $8,642 for a 5/8-inch meter, but the city’s own tap and meter installation charge is set separately each year and we could not obtain the 2026 amount, so that total is incomplete. Tacoma’s published water and wastewater system development charges (SDCs) plus its water tap charge come to $9,243, also at a 5/8-inch meter, but the wastewater SDC is only published at that size, and the physical sewer connection for new construction is billed as a share of the building permit’s valuation rather than a flat fee, so no single number covers it. Seattle publishes a complete figure starting at 3/4 inch, the smallest meter it lists: $14,630 on a non-arterial street or $16,005 on an arterial one, before its separate drainage SDC. Our database covers Seattle Public Utilities, the City of Spokane, and Tacoma Water and Environmental Services so far. Other Washington utilities are not yet collected, and we say so rather than guess.

Official fees in Washington

The table below lists every verified Washington fee row in our database, with utility, meter size, effective date and a link to the source document. Washington cities use different names for the same two kinds of one-time charge. The first pays for a share of existing system capacity: Seattle and Tacoma both call it a system development charge (SDC), and Spokane calls it a general facilities charge (GFC). The second pays for the physical work of making the connection: Seattle calls it a water service installation, Tacoma a water service construction charge, and Spokane a tap and meter charge that its code does not fully publish. All three cities size at least the capacity charge by water meter size.

City	Provider	Water typical new home*	Sewer typical new home*
Seattle	Seattle Public Utilities	$11,700	$2,600
Spokane	City of Spokane Public Works (Water and Wastewater)	$3,475	$4,887
Tacoma	Tacoma Power (Tacoma Public Utilities)	$5,904	$3,339

* Simplified sum of default official residential fees for a standard meter and one unit where applicable. Confirm your actual charges with the utility.

City comparison

Published 2026 water + wastewater one-time charges for one new single-family home, at the smallest meter size each utility publishes a complete figure for (sources: city pages linked below).

City	Local term	Meter	Capacity charge(s)	Tap / install charge	Total (published)
Seattle	System development charge	3/4″	$9,500 ($6,900 water + $2,600 wastewater)	$5,130 ($4,800 install + $330 meter, non-arterial)	$14,630
Spokane	General facilities charge	5/8″	$8,362 ($3,475 water + $4,887 wastewater)	$280 ($65 tap/meter application + $215 side sewer permit)	$8,642 (tap/meter charge itself not published)
Tacoma	System development charge	5/8″	$4,543 ($1,204 water + $3,339 wastewater)	$4,700 (water service construction charge)	$9,243 (excludes the valuation-based sewer connection fee)

How the totals are built. Seattle: $6,900 water SDC + $2,600 wastewater SDC + $4,800 water service installation + $330 meter = $14,630 on a non-arterial street; on an arterial street the installation charge rises to $6,175, for $16,005. Spokane: $3,475 water GFC + $4,887 wastewater GFC + $65 tap and meter application + $215 side sewer permit = $8,642; the city’s actual tap and meter charge is set in a yearly public rule we could not access, so the true total is higher. Tacoma: $1,204 water SDC + $4,700 water service construction charge + $3,339 wastewater SDC = $9,243; the side sewer connection is billed separately, either as a flat $580 permit (for reconnecting an existing house) or, for a new single-family home, as 65% of the building permit fee plus 45% for plan review, both scaled to the home’s ICC valuation, so it can’t be reduced to one number here.

On the pieces that are published and genuinely comparable, Tacoma’s capacity charges are the lowest of the three: $4,543 combined water and wastewater SDC, against $8,362 in Spokane and $9,500 in Seattle at Seattle’s 3/4-inch minimum. Seattle’s $5,130 tap-and-meter charge is close to Tacoma’s $4,700 water tap charge; Spokane does not publish a comparable figure at all, which is why its $8,642 total understates the real cost.

City pages with the full fee rows, payment timing and local caveats: Seattle Public Utilities SDCs and water tap costs, Spokane general facilities charges and tap fees, and Tacoma water and sewer tap and connection fees.

What decides your number

Which utility serves the address. Washington has no statewide fee schedule. Seattle Public Utilities, the City of Spokane, and Tacoma Water and Environmental Services each set their own charges under their own ordinances and their own timelines.
Meter size. All three cities price at least the capacity charge by meter size. Going from Seattle’s 3/4-inch to 1-inch meter adds $6,650 to the two SDCs. Going from Tacoma’s 5/8-inch to 1-inch meter adds $1,768 to the water SDC and $150 to the tap charge, and Tacoma doesn’t publish a wastewater SDC above 5/8 inch at all. Spokane’s combined GFC rises from $8,362 at 5/8 inch to $20,904 at 1 inch.
Whether the street is an arterial (Seattle only). Seattle’s water service installation charge is $1,375 higher on an arterial street at 3/4 inch: $6,175 instead of $4,800.
What the utility hasn’t published. Spokane’s own tap and meter charge and Tacoma’s valuation-based site development fee are both real costs that don’t reduce to a single published number. Ask each utility directly for those two pieces before finalizing a budget.
Timing. All three schedules are moving in 2026: Seattle added its wastewater and drainage SDCs January 1, 2026; Spokane’s GFCs took effect January 18, 2026 and reset every January 1 after that; Tacoma’s wastewater SDC is brand new as of July 1, 2026, and its water SDC and tap charge are on a phase-in schedule that rises again every January 1 through 2029-2030.

Seattle, Spokane and Tacoma are the only Washington utilities in our database so far. Other Washington cities and districts may use the same SDC or GFC terminology, or different terms entirely, and their fees are not yet collected here.

Costs beyond the utility’s fees

None of the three cities’ published totals above cover the private work between the utility’s connection and the house, and in Spokane and Tacoma part of the utility’s own charge is missing too. For a full budget, add these national estimates, not Washington figures (methodology):

Water service line: $30 to $150 per foot, $50 typical.
Sewer lateral / side sewer: $50 to $250 per foot, $100 typical.
Trenching in normal soil: $4 to $15 per foot, $8 typical. Rock multiplies this 2.5 to 7 times.
Plumbing permit: $100 to $1,300, $300 typical.
Street cut or bore, if the main is across the street: $1,000 to $10,000, $4,000 typical.

Worked example: a Tacoma infill lot with the house 50 feet from the street. The published utility fees are $9,243. Typical private work adds 50 × $50 = $2,500 (water line) + 50 × $100 = $5,000 (side sewer) + $300 (permit), for a planning total near $17,043, before whatever the valuation-based site development fee adds on top. Run your own lot through the calculator:

Frequently asked questions

How much are water and sewer tap fees in Washington?

It depends entirely on the utility. For 2026, published charges for a new single-family home run from $8,642 in Spokane (5/8-inch meter, capacity charges plus permits; the tap and meter charge itself isn’t published) to $9,243 in Tacoma (5/8-inch meter) to $14,630-$16,005 in Seattle (3/4-inch meter, depending on whether the street is an arterial).

What is a system development charge in Washington?

It’s a one-time charge for capacity in a utility’s existing water and sewer systems, separate from the physical cost of the connection. Seattle and Tacoma call it a system development charge (SDC). Spokane’s version is called a general facilities charge (GFC); it works the same way.

Which Washington city has the lowest utility connection costs?

Among the three cities we’ve verified, Tacoma’s published capacity charges are the lowest: $4,543 combined water and wastewater SDC at a 5/8-inch meter, against $8,362 in Spokane and $9,500 in Seattle’s 3/4-inch minimum. But Tacoma’s total is incomplete, since its sewer connection is billed as a share of the building permit valuation rather than a flat fee, so the real cost for a specific house could be higher.

Does meter size change the fee in these Washington cities?

Yes, in all three. Seattle’s water and wastewater SDCs multiply by 1.7 going from 3/4 inch to 1 inch, adding $6,650. Tacoma’s water SDC rises from $1,204 to $2,972 at 1 inch. Spokane’s combined water and wastewater GFC rises from $8,362 at 5/8 inch to $20,904 at 1 inch.

Other state hubs: Colorado, Arizona, North Carolina and Utah. City pages: Seattle, Spokane and Tacoma. Guides: tap fee vs. impact fee, cost to bring utilities to land, utility costs for new construction and tap fees by city.

Sources

System Development Charge (Revised SDC 1/1/2026), Seattle Public Utilities. Checked Sep 24, 2026.
Director’s Rule FIN-220.2, Development Charges, Seattle Public Utilities. Checked Sep 24, 2026.
SMC 13.04.2044, Water General Facilities Charge Schedule, City of Spokane. Checked Sep 25, 2026.
SMC 13.03.0734, Wastewater General Facilities Charge Schedule, City of Spokane. Checked Sep 25, 2026.
Tacoma Municipal Code 12.10.310, System Development Charge, City of Tacoma / Tacoma Water. Checked Sep 25, 2026.
Wastewater System Development Charges FAQ, City of Tacoma Environmental Services. Checked Sep 25, 2026.
National cost estimates: Utility Cost Guide benchmark methodology.