Reconcile a separate sewer adjustment

A townhome uses 15 m³ in both periods. Its bill shows an unchanged flat water rate and a new USD 9 sewer adjustment on a separate line.

Inputs and calculation

Usage: (15 − 15) × 2 = 0. Rate: 15 × (2 − 2) = 0. Actual bill difference: 57 − 48 = 9. Residual: 9 − (0 + 0) = 9. All effects are in USD.

Tool result · USD 9.00

Usage: (15 − 15) × 2 = 0. Rate: 15 × (2 − 2) = 0. Actual bill difference: 48 − 48 = 0. Residual: 0 − (0 + 0) = 0. All effects are in USD.

Tool result · USD 0.00

What the comparison shows

The residual matches the documented adjustment. Whether it repeats depends on the supplier’s adjustment description.

Assumptions and limits

This example models the water rate separately. Where sewer charges scale with consumption, a single residual can mix several effects.

Related guides and examples

• Why your utility bill changed
• Estimated meter readings and catch-up bills
• A practical investigation of an unexpectedly high water bill
• Convert a US gallon meter for a CCF tariff
• Read a four-person flat-rate water bill
• Combine water and sewer unit charges
• Include volumetric sewer charges in leak costs