For a Santa Venetia purchase, the most useful ownership budget begins by identifying who issues each charge and what it pays for. A sewer service amount collected on the tax roll, an association contribution, a flood-protection district and a future repair are different entries. Adding them without tracing the actual bills can hide an important obligation or count the same cost twice. A seller’s total spending is also an imperfect guide when the buyer’s household, financing and assessed value will differ.
This article supplies a current-tariff utility illustration and a framework for the remaining costs. The two profiles are hypothetical single-family accounts, not actual homes or quoted annual ownership totals. The Santa Venetia overview provides local orientation. Here, the goal is a budget whose documents, assumptions and missing inputs are visible before a purchase decision.
Begin with the parcel’s actual tax bill and ownership documents
Marin’s secured tax-bill guide separates assessed value, tax rates, direct charges and special assessments. Obtain the current bill for the candidate APN and identify each agency responsible for a line item. Keep an image or statement of the full bill, but assign every component to only one budget category. A direct charge collected through the tax system can still be a utility expense for planning purposes.
The seller’s assessed-value history should not be treated as the buyer’s settled tax forecast. The Assessor’s value-notice guidance explains supplemental assessments following ownership changes or completed new construction, and distinguishes a notice from the subsequent bill. Ask the appropriate tax professional and agencies how the actual transaction affects the estimate. Keep the expected first-year cash timing separate from the recurring annual planning amount.
Also obtain the title report, recorded restrictions and any association or shared-maintenance documents. Confirm whether dues exist, how they are collected, what they include and which private costs remain with the homeowner. A charge named “assessment” might be a public levy, an association special assessment or a contractual cost-sharing payment. Its label alone does not establish whether it repeats, can change or is already included in another invoice.
Separate flood protection, navigation and private maintenance
The County’s Community Service Areas directory describes CSA 6’s navigation interest along Lower Gallinas Creek, CSA 18’s parks purpose and CSA 19’s contracted structural-fire service. These are distinct public arrangements. Their presence in a community directory does not prove that a candidate parcel has each charge or that every associated service has the same boundary. Use the parcel bill and responsible agency to establish the applicable amount.
The floodwall requires a separate timing note. The October 22, 2026 Notice of Determination records approval on October 20. The contemporaneous staff report says sufficient construction funding and property rights remain unresolved delivery issues, and that the action does not approve a construction contract or new local funding mechanism. A planning-level public project budget cannot be divided by neighborhood homes and presented as an adopted homeowner bill.
For a creekside property, request the actual signed agreements and project correspondence. Separate any personal maintenance duty from potential future public financing. Record the latter as an unresolved issue requiring monitoring until an actual measure, adopted charge or parcel notice supplies an amount. An unexplained zero creates false certainty; a clearly described unknown tells the buyer what still needs an answer and when the file should be refreshed.
Use the current water tariff with the right account assumptions
The Marin Water schedule effective July 1, 2026 supplies the model below. Assume each profile has a three-quarter-inch single-family meter. Fixed service and capital charges total $122.83 per two-month period. Water use is charged in tiers, with a separate watershed amount per unit. One unit is 100 cubic feet, approximately 748 gallons. Confirm the actual provider, meter and customer class before substituting a candidate’s usage.
Profile A assumes 12 units in every two-month period; Profile B assumes 20. These deliberately different usage assumptions reveal the tier effect without claiming that a particular yard or household consumes either amount. The illustration holds the tariff constant for six periods. It is a sensitivity calculation, not a prediction of weather, occupancy, leaks or future rates. For an actual estimate, use the household’s expected use and examine the seller’s full seasonal account history.
Marin Water’s billing page confirms the July 2026 schedule and discusses a separate rate-setting process for anticipated July 2027 changes. A twelve-month annualization at today’s tariff should therefore not be mistaken for a promise about bills across a later fiscal year. Note the model date and replace its inputs when the applicable schedule changes.
Identify the sewer charge and avoid counting it twice
The Las Gallinas Valley Sanitary District current schedule lists $1,641 annually effective July 1, 2026, and says most residential and nonresidential sewer fees appear on property tax bills. The illustration assumes one basic annual charge for each profile. It does not establish the candidate’s service, capacity classification, discount eligibility or actual tax-roll amount. Have the District confirm those details, particularly where the property contains additional accommodation.
If the full property-tax payment already contains that sewer charge, deduct it from the tax category before adding a separate sewer row. The same principle applies to any utility included in association dues. A comparison can legitimately organize costs differently for readability, but it must reconcile to the underlying bills. Keep the collection method beside each line so the buyer can plan both the true expense and the timing of cash payments.
Original two-profile utility comparison
Illustration checked October 26, 2026. Both profiles assume a three-quarter-inch single-family Marin Water account, six identical two-month periods and one LGVSD basic annual sewer charge. These are not inspected properties, bills or full ownership totals.
| Input or result | Profile A | Profile B |
|---|---|---|
| Water units per two months | 12 | 20 |
| Fixed water charges per period | $122.83 | $122.83 |
| Tiered use plus watershed per period | $138.24 | $247.05 |
| Water total per period | $261.07 | $369.88 |
| Water annualized at six periods | $1,566.42 | $2,219.28 |
| Assumed basic annual sewer charge | $1,641.00 | $1,641.00 |
| Modeled utility subtotal only | $3,207.42 | $3,860.28 |
Annual difference: $652.86. A water formula: 71.76 + 51.07 + 12 × (10.86 + 0.66). B water formula: 71.76 + 51.07 + 15 × 10.86 + 5 × 14.19 + 20 × 0.66. Multiply each period total by six and add the assumed sewer charge. Calculations checked with decimal arithmetic.
Inputs: Marin Water July 2026 table and LGVSD current rate. Excludes taxes, financing, insurance, other utilities, discounts, ancillary fees, association costs, private maintenance and capital work. Never add this sewer subtotal again if already included in the full tax-bill total.
Keep transaction expenses and condition-based reserves distinct
An association budget needs its own reconciliation. Identify whether the quoted dues cover insurance, exterior maintenance, reserves, landscaping or only a limited common facility. Request the adopted budget and the information supporting upcoming capital work, then compare the owner’s retained responsibilities with an otherwise similar property. A lower regular payment may coexist with a larger owner-funded repair. Without actual documents, an apparent monthly saving cannot be turned into a reliable annual advantage.
Insurance also changes what cash reserves must cover. The California Department of Insurance consumer guide explains that flood and wear-and-tear losses are generally excluded from standard homeowners coverage. Ask a licensed insurance professional to identify the candidate’s actual protections, exclusions and deductibles. A premium alone is insufficient for comparing ownership costs when one proposal leaves a material exposure uninsured or uses different limits.
Keep an operating column for expected recurring spending and a separate cash-reserve column for deductible exposure and irregular work. Do not label the reserve as an actual contractor cost. Its purpose is to make the household’s chosen cushion explicit while the inspection and quote process supplies firmer evidence about the property.
Some local costs occur around the sale rather than every year. The District’s May 2026 fee schedule distinguishes standard and expedited lateral-review fees. Those administrative fees do not include a private plumber’s inspection or the price of any repair. Ask for the actual scope and quote. Keep these transaction amounts out of the recurring utility subtotal unless the budget explicitly amortizes them as a separate planning choice.
Transfer tax also belongs in the transaction worksheet. The County fee page states the County documentary-transfer-tax basis. The official Measure W information concerns a City of San Rafael proposal on the future November 3, 2026 ballot. Do not apply a city proposal to an unincorporated parcel merely because its mailing address says San Rafael, or describe a future vote as an adopted outcome.
Finally, build maintenance allowances from the inspection file. Identify the roof, drainage, private sewer line, exterior materials and any shared equipment; record age evidence, present findings and the next professional recommendation. Obtain comparable insurance terms for the same occupancy and coverage assumptions. Leave unquoted repairs unpriced rather than filling the page with invented estimates. The Marin County guide and financing resources provide the wider framework for combining this local evidence with the buyer’s actual monthly capacity.
