County contract approvals

17 contracts that the Sonoma and Napa County Boards of Supervisors approved or have on an agenda, meetings in the last 90 days and upcoming, quoting the agenda item. Every item links to the official agenda or minutes.

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Who the counties are paying

Contractor	Approvals	Total stated
Kleinfelder, Inc.	2	$1.5M
Peterson Structural Engineers, Inc.	1	$1.5M
GHD, Inc.	2	$1.3M
ADKO Engineering, Inc.	3	$1.2M
InfraTerra, Inc.	1	$1.0M
Schaaf & Wheeler, Consulting Civil Engineers	1	$1.0M
Environmental Science Associates	1	$500,000
Geologic Associates, Inc.	1	$500,000
Nacht & Lewis Architects, Inc.	1	$367,700
Gaya Coating Consulting Inc.	1	$303,535

Amounts as stated in the item (often a not-to-exceed maximum); agreements without an amount count without one.

$457,649 maxMeeting Sep 29, 2026

GHD, Inc.

additional construction management and inspection services for the “Wastewater Ponds Groundwater Inflow Mitigation Project, LB 18-02.”

Napa County Board of Supervisors · Lake Berryessa Resort Improvement District · Category 5413 Architecture, engineering & inspection (inferred)

On the agendaNapa County, CA

K. Approve and authorize Amendment No. 4 to Agreement No. 240306B (LBRID) with GHD, Inc. to increase the contract amount by $16,000 increasing total compensation from $441,649 to $457,649 to provide additional construction management and inspection services for the “Wastewater Ponds Groundwater Inflow Mitigation Project, LB 18-02.” (Fiscal Impact: $16,000 Expense, Lake Berryessa Resort Improvement District; Budgeted; Discretionary) 26-1665 AgreementAttachments:

View the agenda → · Agreement 240306B

$500,000 maxMeeting Sep 15, 2026

Kleinfelder, Inc.

geotechnical services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

B) Authorize Sonoma County Water Agency’s General Manager acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with Kleinfelder, Inc., in substantially the form presented to this Board, for geotechnical services through June 30, 2031, in the not-to-exceed amount of $500,000. Department or Agency Name(s): Sonoma County Water Agency, Occidental County Sanitation

View the agenda →

$500,000 maxMeeting Sep 15, 2026

Geologic Associates, Inc.

geotechnical services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

A) Authorize Sonoma County Water Agency’s General Manager acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with Geologic Associates, Inc., in substantially the form presented to this Board, for geotechnical services through June 30, 2031, in the not-to-exceed amount of $500,000.

View the agenda →

$367,700 maxMeeting Sep 15, 2026

Nacht & Lewis Architects, Inc.

construction support services for the Fifth Street Garage and Napa Library Maintenance Project, PW 25-13

Napa County Board of Supervisors · Public Works · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedNapa County, CA

S. Approve and authorize Amendment No. 2 to Agreement No. 250313B with Nacht & Lewis Architects, Inc., to increase the contract maximum amount from $330,900 to $367,700 to provide construction support services for the Fifth Street Garage and Napa Library Maintenance Project, PW 25-13. (Fiscal Impact: $36,800 Expense; Library Fund; Budgeted; Discretionary) Enactment No: A-250313B Amend. 2

View the minutes → · Agreement 250313B

$303,535 maxMeeting Sep 15, 2026

Gaya Coating Consulting Inc.

coating inspection services

Sonoma County Board of Supervisors · Sonoma County Water Agency · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

D) Authorize the General Manager of the Sonoma County Water Agency to execute an agreement with Gaya Coating Consulting Inc., in substantially the form as the draft presented to this Board, for coating inspection services through March 30, 2028, in the not-to-exceed amount of $303,535. (2/3rd Vote Required) (First District) Department or Agency Name(s): Sonoma County Water Agency

View the agenda →

Amount not statedMeeting Sep 15, 2026

Mead & Hunt, Inc.

planning, engineering, architectural, and related services:

Sonoma County Board of Supervisors · Public Infrastructure · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

B) Approve and authorize the Director of Public Infrastructure to execute the following task orders with Mead & Hunt, Inc. under the Airport's Master Agreement for planning, engineering, architectural, and related services:

View the agenda →

Amount not statedMeeting Sep 15, 2026

BKF Engineers

survey and mapping services:

Sonoma County Board of Supervisors · Public Infrastructure · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

A) Approve and authorize the Director of Public Infrastructure to execute the following task orders with BKF Engineers under the Airport's Master Agreement for survey and mapping services:

View the agenda →

$1.0M maxMeeting Aug 25, 2026

Kleinfelder, Inc.

as-needed engineering design services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

B) Authorize Sonoma County Water Agency’s General Manager acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with Kleinfelder, Inc., in substantially the form presented to this Board, for as-needed engineering design services through June 30, 2031, in the not-to-exceed amount of $1,000,000. Department or Agency Name(s): Sonoma County Water Agency, Occidental County Sanitation

View the agenda →

$500,000 maxMeeting Aug 25, 2026

Environmental Science Associates

as-needed hydrology and hydraulic services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

A) Authorize Sonoma County Water Agency’s General Manager to execute an agreement with Environmental Science Associates, in substantially the form presented to this Board, for as-needed hydrology and hydraulic services through August 31, 2031, in the not-to-exceed amount of $500,000.

View the agenda →

$1.5M maxMeeting Aug 18, 2026

Peterson Structural Engineers, Inc.

structural engineering design services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

A)Authorize Sonoma County Water Agency’s General Manager acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with Peterson Structural Engineers, Inc., in substantially the form presented to this Board, for structural engineering design services through June 30, 2031, in the not-to-exceed amount of $1,500,000.

View the agenda →

$1.0M maxMeeting Aug 18, 2026

InfraTerra, Inc.

structural engineering design services

Sonoma County Board of Supervisors · Sonoma County Water Agency, Occidental County Sanitation · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

B) Authorize Sonoma County Water Agency’s General Manager acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with InfraTerra, Inc., in substantially the form presented to this Board, for structural engineering design services through June 30, 2031, in the not-to-exceed amount of $1,000,000. Department or Agency Name(s): Sonoma County Water Agency, Occidental County Sanitation

View the agenda →

$157,286 maxMeeting Aug 4, 2026

Carollo Engineers, Inc.

Sea Ranch asset valuation services

Sonoma County Board of Supervisors · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

17. Sea Ranch Asset Valuation 2026-0742 Authorize Sonoma County Water Agency’s General Manager to execute an agreement with Carollo Engineers, Inc., in substantially the form presented to this Board, for Sea Ranch asset valuation services through July 30, 2027, in the not-to-exceed amount of $157,286. Department or Agency Name(s):

View the minutes →

$427,692 maxMeeting Jul 28, 2026

ADKO Engineering, Inc.

additional engineering services for Diamond Road Slide Repair Project

Napa County Board of Supervisors · Public Works · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedNapa County, CA

AF. Approve and authorize the Chair to sign Amendment No. 1 to Agreement No. 260303B with ADKO Engineering, Inc. increasing the 26-1422 contract maximum from $19,507 to $427,692 to provide additional engineering services for Diamond Road Slide Repair Project. (Fiscal Impact: $400,000 Expense, additional funds requested for the project costs; General Fund; Reallocation of Budget; Discretionary) Enactment No: A-260303B Amend. 1

View the minutes → · Agreement 260303B

$423,176 maxMeeting Jul 28, 2026

ADKO Engineering, Inc.

additional biological monitoring and preconstruction survey services for the Project

Napa County Board of Supervisors · Public Works · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedNapa County, CA

approve and authorize Amendment No. 1 to Agreement No. 260300B with ADKO Engineering, Inc. increasing the contract maximum from $366,922 to $423,176 to provide additional biological monitoring and preconstruction survey services for the Project. (Fiscal Impact: $955,000 Expense for the construction contract and other project costs; General Fund; Reallocation of Budget; Discretionary) Enactment No: A-260300B Amend. 1

View the minutes → · Agreement 260300B

$356,740 maxMeeting Jul 28, 2026

ADKO Engineering, Inc.

additional engineering services for the Project

Napa County Board of Supervisors · Public Works · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedNapa County, CA

approve and authorize Amendment No. 1 to Agreement No. 260302B with ADKO Engineering, Inc. increasing the contract maximum from $319,389 to $356,740 to provide additional engineering services for the Project. (Fiscal Impact: $900,000 Expense for the construction contract and other project costs; General Fund, Reallocation of Budget; Discretionary) Enactment No: A-260302B Amend. 1 Board of Supervisors Meeting Minutes July 28, 2026 Page 7 of 12

View the minutes → · Agreement 260302B

$1.0M maxMeeting Jul 14, 2026

Schaaf & Wheeler, Consulting Civil Engineers

as-needed sanitation engineering services

Sonoma County Board of Supervisors · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

27. As-Needed Sanitation Engineering 2026-0656 Authorize Sonoma County Water Agency’s General Manager, acting on behalf of Sonoma County Water Agency, Occidental County Sanitation District, Russian River County Sanitation District, Sonoma Valley County Sanitation District, and South Park County Sanitation District to execute an agreement with Schaaf & Wheeler, Consulting Civil Engineers, in substantially the form presented to this Board, for as-needed sanitation engineering services through December 31, 2031, in the not-to-exceed amount of $1,000,000. Department or Agency Name(s):

View the minutes →

$836,970 maxMeeting Jul 14, 2026

GHD, Inc.

design services for the leachate tank at the Roblar location to increase the total contract amount by $28,835.81

Sonoma County Board of Supervisors · Category 5413 Architecture, engineering & inspection (inferred)

ApprovedSonoma County, CA

22. Third Amendment - Engineering Services for Design of Leachate and Potable Water Storage Tank Replacements Project 2026-0655 Authorize the Chair to execute a Third Amendment to the Professional Agreements with GHD, Inc. for design services for the leachate tank at the Roblar location to increase the total contract amount by $28,835.81, for a new, total, not-to-exceed amount of $836,969.81. Department or Agency Name(s):

View the minutes →

Also as JSON. Categories are NAICS-like codes inferred from what the item says the contract is for; check the item before relying on them. Revenue agreements, grants, leases and licences are left out.