Quick Answer
A drought surcharge is a temporary charge a utility adds during a declared drought stage. It can appear as its own line item or as a higher volumetric rate on the portion of water you use above a trigger. It ends when the declared stage ends — usually, though some structures are designed to stay as permanent conservation pricing.
Because triggers, rates, and billing units differ by utility, the reliable way to review a drought-related charge is to read your local tariff and compare it against your billed usage. Start with the current statement, find the charge name, and match it to the utility’s published rate schedule and drought notice. The three real mechanisms below show how different they can be.
Why Drought Surcharges Exist
Utilities impose drought surcharges to do two things at once: raise revenue for drought-response costs and push the largest users to cut back. The charge is normally tied to volume — the more water you use, the more you pay. It is not a fine for violating a restriction; it is a rate design. Some apply a percentage to the flow charge, some a flat fee per thousand gallons above a threshold, and some a seasonal excessive-use charge. There is no single national formula.
Three Real Mechanisms
The table below compares three different models. Notice how different the trigger and rate are for each — that is the key takeaway: never assume a drought surcharge works like the one you saw on a neighbor’s bill.
| Utility | Charge name | Trigger | Rate | Status |
|---|---|---|---|---|
| East Bay Municipal Utility District (CA) | Drought surcharge | Stage 2 drought emergency declared April 26 2022; 10% conservation mandate vs 2020 | 8% added to flow charges (volume of water used) | Historical — approved May 10 2022, effective July 1 2022; stayed until declaration lifted |
| San Antonio Water System (TX) | High-use drought surcharge | Residential use above 20,000 gal/month in Stage 3; above 12,000 gal/month in Stage 4 | $10.37 per 1,000 gallons above the threshold | Active — effective for consumption on/after July 6 2024 |
| Las Vegas Valley Water District (NV) | Excessive Use Charge (EUC) | Use above seasonal thresholds (approx. 14,000 gal winter, 16,000 spring, 28,000 summer, 26,000 fall) | $9 per 1,000 gallons above the seasonal threshold | Active — ongoing structure, not tied to a declared stage ending |
Worked Example: Before and After
Let’s compare a household using 6 CCF (748 gallons per CCF, so 6 CCF = 4,488 gallons) in a month. That is a modest baseline.
Under SAWS Stage 3, the trigger is 20,000 gallons per month. A 4,488-gallon month is far below the trigger, so the high-use drought surcharge does not apply. Your bill would only reflect the base water and sewer charges under the current tariff.
Now suppose that same household has a 25,000-gallon month — perhaps a big irrigation event or a fill of a pool. Subtract the Stage 3 threshold:
25,000 − 20,000 = 5,000 gallons over the threshold
5,000 ÷ 1,000 = 5 units
5 × $10.37 = $51.85
That $51.85 matches SAWS’s own published example. [1] Notice the surcharge applies only to the excess, not the whole bill.
EBMUD’s model is different: an 8% surcharge on the flow charge. The district published that an average single-family customer using 200 gallons per day would pay about $0.10 per day, $3.08 per month, or $6.16 per two-month cycle. [2] That is a much smaller dollar impact than the SAWS example because EBMUD charges a percentage of the flow charge rather than a large per-thousand-gallon penalty above a high threshold. It was also historical: the surcharge stayed in place until the drought emergency declaration was lifted, and it no longer applies. A labeled historical schedule is acceptable evidence of how a prior surcharge worked.
LVVWD’s Excessive Use Charge works differently again: the thresholds scale with the billing period length, and the charge is $9 per 1,000 gallons above a seasonal threshold. The annual allowance is 252,000 gallons, and the thresholds are set at more than two times the median seasonal use, so roughly the top 10% of residential users are affected. More than half of charged customers receive the charge only once or twice, which shows it is aimed at occasional big users rather than steady median households. [3]
What to Check on YOUR Bill
To review a drought charge on your own bill, follow this tariff-first method:
- Identify the charge name. Look for words like “drought surcharge,” “high-use surcharge,” or “excessive use charge.” Write down the exact label and any tariff reference.
- Confirm the declared drought stage. Your utility’s website or bill insert should state the current stage and its effective date. Not every stage triggers a surcharge.
- Find the trigger and rate. Check the published rate sheet for the threshold (gallons, CCF, or billing units) and the rate (percentage or dollars per 1,000 gallons).
- Compare against your billed usage. Use the bill’s usage for the same billing period. Calculate the excess above the threshold, then apply the rate.
- Check for other changes. Make sure the bill includes the same number of billing days, the meter was read, and no estimate adjustment or leak fee is mixed in.
- Contact the utility. If the calculation does not match, ask for the tariff reference, the usage used, and the exact formula. Provide documentation if you believe there is an error.
FAQ
Is a drought surcharge permanent?
Why penalize high users instead of spreading the cost evenly?
Does every conservation stage include a surcharge?
Can a drought surcharge be disputed?
Does the surcharge apply to the whole bill or just the excess?
Sources
- San Antonio Water System: High-Use Drought Surcharge (retrieved 2026-08-29)
- East Bay Municipal Utility District: EBMUD Approves 8 Percent Drought Surcharge (retrieved 2026-08-29)
- Las Vegas Valley Water District: Excessive Use Charge FAQ (retrieved 2026-08-29)
- Austin Water: Drought Response (retrieved 2026-08-29)
- EPA WaterSense: Understanding Your Water Bill
- EPA: Water Affordability Resources for Utilities
