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Earlier editions: 2026-09

Title 16 — SUBDIVISIONS

Alameda County Municipal Code Ch. 16.20 Improvements

Alameda County Municipal Code · 2026-10 edition · updated 2026-10-04 · Alameda County

Cite as: Alameda County Municipal Code Chapter 16.20 · Text as of 2026-10-04

16.20.010 - Duty of subdivider to improve streets, etc.

The subdivider may be required to improve all streets, highways, public ways and easements which are a part of the subdivision.

(Prior gen. code § 8-4.0)

Exceptions & meaning →

16.20.020 - Required improvements.

The required improvements shall include:

A. Grading and surfacing of streets, highways and public ways, and the drainage thereof;

B. The grading of the lots and the drainage thereof as may be required by the design of the approved tentative map;

C. The construction and installation of debris basins and the installation of erosion and siltation control measures as may be necessary to control erosion and siltation;

D. For any subdivision requiring a final map, domestic water supplied by a public utility subject to regulation by the Public Utilities Commission of the state or by a public agency authorized to levy taxes for such purposes which has consented in writing to provide such water. For all other subdivisions, a water supply of the extent required above for a subdivision, or to any lesser extent as may be determined by the health officer as sufficient to protect the public health, considering the uses and intensity of development permitted in the area of the land division;

E. For all subdivisions having lots less than forty thousand (40,000) square feet, a sanitary sewer system and sewage disposal works serving each lot administered by a public agency authorized to levy taxes for such purposes, which agency has consented in writing to provide such service. For any other subdivision a sewage disposal system of such extent as may be determined by the health officer as sufficient to protect the public health, considering the uses and intensity of development permitted in the area of the land division;

F. Construction of such structures as may be necessary for public safety, including but not limited to local neighborhood drainage, traffic safety signs and devices, and street lighting;

G. In case of a subdivision included in a fire district the subdivider shall install water mains, fire hydrants, gated connections and appurtenances to provide water supply for fire protection in conformance with standards, if any, established by the fire district, and where no such standards have been established by the fire district, or where a land division is not included in a fire district, the subdivider shall make such installations in conformity with the latest standards established by the insurance services office.

(Prior gen. code § 8-4.1)

Exceptions & meaning →

16.20.030 - Limitations for subdivision into four or less lots.

Improvements that may be required by the advisory agency for subdivision into four or less lots are limited to the dedication of rights-of-way, easements, and the construction of reasonable off-site and on-site improvements for the lots being created. Requirements for the construction of such off-site and on-site improvements shall be evidenced by an agreement or a deferred improvement agreement entered into between the subdivider and the county or a local agency, and shall be recorded on, concurrently with, or prior to the parcel map or instrument of waiver of parcel map being filed for record. Such agreement may be executed by the county engineer.

Fulfillment of such construction requirements shall not be required until such time as the construction of such improvements is required pursuant to the agreement between the subdivider and the county or local agency, except that in the absence of such an agreement, the county or local agency may require fulfillment of such construction requirements within a reasonable time following approval of the parcel map and prior to the issuance of a permit or other grant for the development of a parcel upon a finding by the county or local agency that the fulfillment of the construction requirements is necessary for reasons of:

A. The public health and safety; or

B. The required construction is a necessary prerequisite to the orderly development of the surrounding area.

(Ord. 95-17 § 1 (part): prior gen. code § 8-4.2)

Exceptions & meaning →

16.20.040 - Standards for improvements.

Except as provided in subsection 16.20.020G of this chapter, all improvements shall be constructed in accordance with standard engineering practices and in accordance with plans and specifications approved by the board supervisors.

(Prior gen. code § 8-4.3)

Exceptions & meaning →

16.20.050 - Inspection by county engineer.

The county engineer shall have the right to enter upon the site of the work for the purpose of inspecting the same and shall be furnished with samples of materials as may be required for the making of tests to determine the acceptability of the materials. This includes both tract and parcel map subdivisions.

(Ord. 95-17 § 1 (part): prior gen. code § 8-4.4)

Exceptions & meaning →

16.20.060 - Cost of inspection.

The subdivider shall pay to the county the actual cost for the inspection of the work and checking materials.

(Prior gen. code § 8-4.5)

Exceptions & meaning →

16.20.070 - Deposit to cover cost of inspection.

Under Deposit—Over Deposit. When the final map or parcel is presented to board of supervisors, the subdivider shall give evidence that he has deposited with the county treasurer a sum in the amount estimated by the county surveyor as being sufficient to cover the costs of inspection and tests. If the amount so deposited exceeds the actual cost to the county, the subdivider shall be reimbursed for the balance remaining. If the actual costs exceeds the deposited amount, the county shall stop all construction until the land divider presents a receipt for a deposit with the county treasurer of an additional sum as estimated by the county surveyor.

(Prior gen. code § 8-4.6)

Exceptions & meaning →

16.20.080 - Improvement security.

In the event an agreement for the improvement of streets or easements, or for the performance of any other act, is entered into between the county and the subdivider, the contract may be secured by any one of the methods provided in Chapter 5 of the Subdivision Map Act.

(Prior gen. code § 8-4.7)

Exceptions & meaning →

16.20.090 - Improvement security—Terms of.

The contract must also specify the time within which the work must be completed and must also specify that should the work not be satisfactorily completed within the time limit, the county shall complete all specified improvements and be completely reimbursed therefor by the owners or owner of the land division. The contract may provide for the improvements to be installed in units, for extension of time under specified conditions or for the termination of the contract upon a reversion of the division of land or a part thereof to acreage.

(Prior gen. code § 8-4.8)

Exceptions & meaning →

16.20.100 - Compliance of improvements—Record drawings and declaration.

Upon completion of improvements, the subdivider shall provide record drawings in the form required by the county surveyor prepared by a civil engineer registered by the state showing the subdivision as it has been completed. For all areas of the subdivision, except those areas within county road rights-of-way and other public lands or easements to be accepted by the county, the civil engineer shall provide in the form required by the county surveyor a declaration that all construction and improvement works have been completed in accordance with the approved plans and specifications and this chapter.

(Prior gen. code § 8-4.9)

Exceptions & meaning →

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