Idaho Utility Connection Costs (2026): Tap Fees by City
In Idaho’s three largest Treasure Valley cities, a new single-family home pays $4,633.62 (Boise) to $7,937.44 (Meridian) in official one-time water and sewer connection charges. Nampa lists $5,867 in current, published impact and hookup fees, rising to about $7,588 once its newest published water hookup and meter fees are added. Boise is the outlier and the cheapest of the three: its city utility, Water Renewal, bills only sewer, and Veolia Water Idaho’s tariff carries no hookup fee where a main already fronts the lot. Meridian and Nampa each run their own combined water and sewer utilities and bill both. One caveat carries through every Boise figure here: the city’s FY 2027 Proposed Budget would raise the same home’s sewer fees from $4,549.20 to $5,133 on October 1, 2026, and as of the review date the city’s budget library still listed only the proposed version, not one confirmed adopted. Private plumbing from each utility’s connection to the house, trenching and permits come on top of every total below.
Official fees in Idaho
The table below lists every verified Idaho fee row in our database, with jurisdiction, fee name, amount and a link to the source document. The three cities structure their charges differently. Boise splits its sewer connection fee into a treatment fee, set by the home’s square footage in five bands, and a trunk fee, set by the lot’s dwelling-unit density in three bands; Veolia Water Idaho’s tariff carries no separate hookup fee where a main fronts the lot. Meridian charges one water assessment and one sewer assessment per equivalent residential unit (ERU), plus a water meter fee that varies by size and by whether the meter shares a vault. Nampa layers impact fees, adjusted for inflation every July 1, on top of hookup fees set by council resolution, plus a meter fee.
| City | Provider | Water typical new home* | Sewer typical new home* |
|---|---|---|---|
| Boise | City of Boise Public Works - Water Renewal | $0 | $4,549.20 |
| Meridian | City of Meridian Public Works (Water & Sewer) | $2,130.44 | $5,807 |
| Nampa | City of Nampa Public Works (Water, Wastewater & Pressure Irrigation) | $1,458 | $5,598 |
* 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
Official city water and sewer connection charges for one typical new single-family home
| City | What is counted | Total |
|---|---|---|
| Boise | FY2026 sewer connection fee for a 2,100 sq ft home on a low-density lot, plus tap-in permit; Veolia water has no hookup fee | $4,633.62 |
| Nampa | Water and wastewater impact fees, wastewater hookup fee, plus the newest published domestic water hookup fee and 1-inch meter connection fee | $7,588.00 |
| Meridian | Water and sewer assessments (1 ERU) plus a 3/4-inch meter, for a permit issued on or after October 1, 2026 | $7,937.44 |
How the totals compare. Boise’s $4,633.62 sits $2,954.38 below Nampa’s $7,588 and $3,303.82 below Meridian’s $7,937.44. Nampa sits $349.44 below Meridian ($7,937.44 − $7,588). Sewer alone tells the same story: Boise’s $4,549.20 treatment-plus-trunk fee (before its $84.42 tap-in permit) is the lowest of the three; Nampa’s sewer share is its $1,815 wastewater impact fee plus $3,783 wastewater hookup fee, or $5,598; and Meridian’s sewer assessment alone is $5,807. Nampa’s total carries a caveat flagged on its own page: the $1,189 domestic water hookup fee and $532 meter fee behind $1,721 of that $7,588 date to an October 2021 resolution, the newest the city has posted, and Nampa has since raised other hookup fees by a producer-price-index formula, so the current water-side figure is probably higher. Boise’s own number is due to change too: the FY 2027 Proposed Budget would raise the 2,100-square-foot, low-density sewer example from $4,549.20 to $5,133 on October 1, 2026, narrowing the gap with Nampa and Meridian — but as of the review date that budget was proposed, not confirmed adopted.
City pages with the full fee rows, worked examples, payment timing and local caveats: Boise sewer connection fees and water hookup costs, Meridian water and sewer assessment fees and Nampa water and sewer hookup and impact fees.
What decides your number
- Which utility bills water. In Boise, Veolia Water Idaho, a private company regulated by the Idaho Public Utilities Commission, supplies water and its tariff has no hookup or capacity fee when a main fronts the lot. In Meridian and Nampa, the city itself charges a water assessment or impact fee on top of sewer.
- Home size versus a flat per-unit rate. Boise’s sewer treatment fee scales with square footage across five bands, and its trunk fee scales with lot density across three bands. Meridian and Nampa each charge a flat rate per ERU or EDU regardless of house size, so a bigger Boise home pays more while a bigger Meridian or Nampa home does not, on the utility fee alone.
- Whether the lot has been served before. A lot that was split, never developed or never connected pays extra. Boise’s equivalent assessment ranges from $2,362.12 to $3,543.18 by lot size in FY2026; Nampa’s water and irrigation resolutions likewise add service-line charges when the city, not a developer, builds the line.
- Meter size and vault sharing. Meridian’s fiscal-2027 meter fee is $434.44 for a 3/4-inch meter in its own vault, $359.86 when two homes share a vault, and $505.44 for a 1-inch meter. Nampa’s fee list separately prices a 1-inch meter connection.
- Timing. Boise’s FY 2027 Proposed Budget, Meridian’s June 1, 2026 assessment increase and October 1, 2026 meter increase, and Nampa’s annual July 1 inflation adjustment can all move these numbers before you pay. Check the latest adopted schedule, not the one on this page, before budgeting.
Frequently asked questions
How much are water and sewer connection fees in Idaho?
It depends on the city. A single-family home pays $4,633.62 in Boise (FY2026 city sewer fee plus tap-in permit; Veolia water has no hookup fee), about $7,588 in Nampa (current impact and hookup fees plus its newest published water hookup and meter fees) and $7,937.44 in Meridian (water and sewer assessments plus a 3/4-inch meter, for permits issued on or after October 1, 2026).
Why is Boise cheaper than Meridian and Nampa?
Boise’s city utility bills only sewer. Most Boise addresses get water from Veolia Water Idaho, a private, IPUC-regulated utility whose tariff has no hookup fee where a main already fronts the lot. Meridian and Nampa each run their own combined water and sewer systems and bill a water charge on top of sewer.
Are Idaho utility connection fees going up?
Yes, in more than one city. Boise’s FY 2027 Proposed Budget would raise its 2,100-square-foot, low-density sewer example from $4,549.20 to $5,133 on October 1, 2026, though it was not confirmed adopted as of the review date. Meridian’s water and sewer assessments rose June 1, 2026, and its meter prices rise again October 1, 2026. Nampa adjusts its impact fees for inflation every July 1.
Which Idaho fee figures on this page are marked for review?
Two. Boise’s FY 2027 sewer figures are proposed, not confirmed adopted, as of the review date. Nampa’s $1,189 domestic water hookup fee and $532 meter fee date to an October 2021 resolution, the newest the city has posted, and the city has since raised other hookup fees by a producer-price-index formula, so the current water-side figure is probably higher than what is shown here.
Related pages
Other state hubs: Utah, Washington, Colorado and Arizona. Nearby cities: Salt Lake City, UT and Denver, CO. Guides: tap fee vs. impact fee, water meter installation cost, cost to run power to a property and tap fees by city.
Sources
- FY 2026 Adopted Budget, Fee Changes, City of Boise. Checked Sep 24, 2026.
- FY 2027 Proposed Budget, Fee Changes, City of Boise. Checked Sep 24, 2026.
- Veolia Water Idaho tariff, effective June 1, 2025 (IPUC Order No. 36624), Veolia Water Idaho. Checked Sep 24, 2026.
- Water & Sewer Fee Increase, effective June 1, 2026, City of Meridian Community Development. Checked Sep 24, 2026.
- Water Meter Fee Increase, FY2027 (effective Oct 1, 2026), City of Meridian Community Development. Checked Sep 24, 2026.
- Bulletin GA-11-2025-35, Development Impact Fee Schedule, City of Nampa Building Safety Department. Checked Sep 24, 2026.
- Resolution No. 30-2023, Wastewater Hookup Fees (effective Dec 1, 2023), City of Nampa. Checked Sep 24, 2026.
- Resolution No. 50-2021, Domestic Water Hookup Fees (effective Oct 1, 2021), City of Nampa. Checked Sep 24, 2026.
- City pages with full sourcing: Boise, Meridian, Nampa.