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**EXHIBIT      31.2**

**CERTIFICATIONS**

|   | 1. | I                have reviewed this Form 10-Q of Sonoma Valley Bancorp;                                                                                                                                                                                                                                                                                                                                        |
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|   | 2. | Based                on my knowledge, this report does not contain any untrue statement                of a                material fact or omit to state a material fact necessary to make                the                statements made, in light of the circumstances under which such statements                were made, not misleading with respect to the period covered by this                report; |

|   | 3. | Based                on my knowledge, the financial statements, and other financial information                included in this report, fairly present in all material respects                the                financial condition, results of operations and cash flows of the                registrant as of, and for, the periods presented in this                report;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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|   | 4. | The                registrant's other certifying officer(s) and I are responsible for                establishing and maintaining disclosure controls and procedures (as                defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant                and have: (a)                Designed such                disclosure controls and procedures, or caused such disclosure controls                and                procedures to be designed                under our                supervision, to ensure that material information relating to the                registrant, including its consolidated                subsidiaries,                is made known to us by others within those entities, particularly                during the                period in which this                report is being prepared; (b)                omitted; (c)                Evaluated the                effectiveness of the registrant's disclosure controls and procedures                and                presented in this report our                conclusions about the                effectiveness of the disclosure controls and procedures, as of the                end of                the period covered                by this report                based on such evaluation; and (d)                Disclosed in this                report any change in the registrant's internal control over financial                reporting that occurred during                the registrant's                most recent fiscal quarter (the registrant's fourth fiscal quarter                in the                case of an annual report)                that has materially                affected, or is reasonably likely to materially affect, the registrant's                internal control over                financial reporting;                and |

|   | 5. | The                registrant's other certifying officer(s) and I have disclosed, based                on                our most recent evaluation of internal control over financial reporting,                to the registrant's auditors and the audit committee of the registrant's                board of directors (or persons performing the equivalent                functions): (a)                All significant                deficiencies and material weaknesses in the design or operation of                internal control over financial                reporting which                are reasonably likely to adversely affect the registrant's ability                to                record, process, summarize                and report                financial information; and (b)                Any fraud, whether or                not material, that involves management or other employees who have                a significant role                in the registrant's                internal control over financial                reporting. |
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| Dated: |       August                8, 2007 |   | /s/                Mary Dieter Smith                                                                               |
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|   |                                                              |   | Mary                Dieter Smith                                                                                   |
|   |                                                              |   | Executive                Vice President and Chief Operating Officerand                Chief Financial Officer |
|   |                                                              |   | (Principal                Financial Officer and Principal Accounting                Officer)                       |

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