22.3 Budgets, Procurement, Cost Analysis & Capital Improvement Planning

22.3 Budgets, Procurement, Cost Analysis & Capital Improvement Planning

Operators contribute to budgets more than they usually realize: the equipment request, the chemical usage projection, the estimate of what a repair will cost. Understanding the framework makes those contributions credible.

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Operating Versus Capital

The threshold that separates them is usually a dollar amount plus a minimum useful life — commonly something like $5,000 and three years, set by the utility's policy.

Typical operating cost distribution at a water or wastewater utility:

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The Revenue Requirement

Rates must generate enough to cover:

$\text{Revenue Requirement} = \text{O\&M} + \text{Debt Service} + \text{Reserves} + \text{Capital funded from rates}$

[!IMPORTANT] A utility that funds only operations and maintenance is not saving money; it is deferring cost onto a future rate payer. Infrastructure fails eventually, and deferred renewal accumulates into a replacement burden far larger than the annual funding that would have prevented it. The industry term for the resulting condition is a replacement cliff. Rate structures that fund renewal — through depreciation funding, a capital reserve, or rate-funded capital — are what keep a system solvent over decades.

Rate structures include uniform volumetric rates, increasing block (tiered) rates that promote conservation and are widely used in Arizona, decreasing block rates (largely disfavored for a scarce resource), seasonal rates, and a fixed base charge plus volumetric charge, which is the most common structure because the base charge recovers the fixed costs that exist regardless of consumption.

The conservation paradox is real: successful conservation reduces sales volume while the utility's costs remain overwhelmingly fixed, so revenue falls faster than cost. A larger fixed component in the rate structure is the standard response.

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Cost Estimating and Analysis

Simple Payback

$\text{Payback (years)} = \frac{\text{Incremental Cost}}{\text{Annual Savings}}$

Worked example. A variable frequency drive costs $42,000 installed and reduces power consumption by $11,500 per year.

$\frac{42,000}{11,500} = 3.7\text{ years}$

Simple payback is the standard first screen because it is quick and intuitive. Its limitation is that it ignores everything after the payback period and ignores the time value of money.

Life-Cycle Cost

$\text{Life-Cycle Cost} = \text{Purchase} + \text{Installation} + \text{Operating} + \text{Maintenance} + \text{Disposal} - \text{Salvage}$

Worked example. Two pumps, each with a 15-year life:

Pump A is $13,000 cheaper to buy and $35,000 more expensive to own. This reversal is the entire point of life-cycle analysis, and it is why energy and maintenance costs belong in a procurement evaluation rather than only the bid price.

Estimating Chemical Cost

$\text{Annual Cost} = \text{Dose (mg/L)} \times \text{Flow (MGD)} \times 8.34 \times 365 \times \text{Unit Cost per lb}$

Worked example. Alum at 22 mg/L, 4.6 MGD, $0.31 per pound:

$22 \times 4.6 \times 8.34 \times 365 \times 0.31 = \$95,500\text{ per year}$

That figure is exactly why a jar test that identifies a 3 mg/L dose reduction is worth roughly $13,000 a year — operator process optimization has direct budget consequences.

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Procurement

[!WARNING] Splitting a purchase to stay under a bid threshold is a procurement violation, even when the intent is only to avoid delay. Ordering the same pump in three separate transactions to remain below a formal bid threshold is treated as circumvention and can result in disciplinary action, audit findings, and personal liability. If the aggregate purchase exceeds the threshold, it goes out to bid.

"Lowest responsive and responsible bidder" is a term of art worth knowing: responsive means the bid conformed to the specification and bidding requirements, and responsible means the bidder has the capability, experience, and financial capacity to perform. The lowest price alone does not win if either test fails.

Conflict of interest rules bar an operator from participating in a purchase decision benefiting a business in which they or a family member hold an interest, and gift and gratuity restrictions apply. Vendor relationships in a small utility community require deliberate care.

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Capital Improvement Planning

A capital improvement plan (CIP) is a multi-year schedule of capital projects with cost estimates and funding sources, typically covering five to ten years and updated annually.

Prioritization criteria: regulatory compliance and public health first, then risk of failure and its consequence, growth and capacity needs, energy and operational savings, and level-of-service improvements.

Funding sources available to Arizona utilities:

WIFA is the single most important capital funding channel for Arizona water and wastewater utilities, administering both the Drinking Water and Clean Water State Revolving Funds, and its application process rewards utilities that have a current CIP, an asset management program, and a demonstrated rate structure adequate to repay the loan.