Ontario Water Restrictions 2026
San Bernardino County · California
Published:
Restrictions Active - Stage 2 + MWD Level 1 – Mandatory Conservation
3
Days/Week
Before 9:00 AM
Allowed Hours
$100 first · $250 second · $500 third+
Max Fine
Find Your Watering Day
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| Address Ending | Watering Day |
|---|---|
| Odd | Monday & Wednesday & Friday |
| Even | Tuesday & Thursday & Saturday |
Allowed Watering Hours
No sprinkler irrigation between 9:00 AM and 6:00 PM year-round. Maximum 12 minutes per spray-head zone per watering day; rotary nozzles 25 minutes. Ontario coordinates with the Inland Empire Utilities Agency (the Chino Basin wholesaler) and MWD's Level 1 framework for cross-jurisdictional consistency.
Still Allowed
💧 Hand Watering
Allowed with shut-off nozzle. Hours: Any day with a shut-off nozzle; drip and soaker hoses exempt.
🌿 Drip Irrigation
Exempt from day-of-week limits. Must follow allowed hours.
Fines & Enforcement
$100 first · $250 second · $500 third+
OMUC Water Conservation patrols neighbourhoods and responds to online complaints. First detected violation: warning. Second: $100. Third: $250. Fourth+: $500. Commercial properties (including warehousing and logistics hubs) face up to $2,000 per occurrence.
Citations begin MWD Level 1 declared March 2026🏠 HOA Rules During Restrictions
California Water Code §10631.5 prohibits HOAs from fining residents for drought-compliant brown lawns during a declared shortage. California Civil Code §4735 prevents HOAs from penalizing homeowners who reduce irrigation under a state or local conservation order, and explicitly allows artificial turf installation notwithstanding CC&R restrictions. The MWD Level 1 declaration plus your local agency's retail stage qualify as the state-recognized triggers – document both if your HOA sends a violation letter.
If your homeowners association sends a violation notice for a dormant or brown lawn during the current restriction period, respond in writing citing the applicable law and include a copy of the current restriction order from Ontario Municipal Utilities Company. Most HOAs will rescind the notice once they are made aware of the legal protections in place. If the issue persists, contact your county’s code enforcement division for assistance.
Why These Restrictions Exist
Ontario is served by Ontario Municipal Utilities Company (OMUC), a member agency of the Metropolitan Water District of Southern California (MWD). On March 2026 MWD declared a Level 1 Water Shortage Condition for all 26 member agencies (covering roughly 19 million residents) – the first regional Level 1 since 2022. The trigger: State Water Project allocation cut to 30% for the 2026 water year, continued Colorado River shortage operating under post-2007 Interim Guidelines, and Diamond Valley Lake (MWD's largest local storage) dropping below the 65% planning threshold.
Ontario sits in the Inland Empire (San Bernardino County) and is an MWD member through the Inland Empire Utilities Agency (IEUA), the Chino Basin wholesaler. Water mix: roughly 70% local Chino Basin groundwater (managed by the Chino Basin Watermaster) and 30% imported MWD water. Ontario is the second-largest Inland Empire warehousing and logistics hub (after Riverside / Moreno Valley) – Amazon, FedEx, UPS, and dozens of e-commerce fulfillment centers operate large facilities here, with significant landscape and operational water footprints. Ontario International Airport (ONT) is a major commercial water user on its own commercial account.
MWD's Level 1 framework asks member agencies to target a 20% reduction in potable water use versus a 2020 baseline. Each retail agency translates that target into local rules – typically 2–3 days per week outdoor watering with a mid-day blackout window. California's permanent year-round baseline (no hosing hardscape, no irrigation within 48 hours of measurable rainfall, no runoff onto sidewalks, shut-off nozzle required on hoses) applies on top of MWD Level 1, regardless of conditions.
This deficit has accumulated over the current water year and represents a significant departure from historical averages for the Ontario area. Water supply reservoirs and aquifer levels are well below seasonal targets, necessitating mandatory conservation measures.
How to Keep Your Lawn Alive During Ontario Water Restrictions
15 tips tailored for Ontario homeowners during Stage 2 + MWD Level 1 – Mandatory Conservation restrictions.
Ontario's inland summers (regularly 100–105°F July–September) make warm-season Bermuda the only Stage-2-friendly lawn grass.
Chino Basin clay sheds water in under 90 seconds – cycle-and-soak (3 min on, 20 pause, 3 min on) is essential.
Stack the IEUA $3/sq ft and SoCal Water$mart $3/sq ft turf rebates – most front-yard removals net $4–$5/sq ft total after combined rebates.
Logistics-hub landscape strips (warehouse perimeters, parking-lot islands) are high-water-loss zones – convert to drip-irrigated California-Friendly under the IEUA commercial program (up to 25,000 sq ft per parcel).
Programme your controller now for Ontario's assigned 2-day-per-week schedule (see the watering days finder above) and respect the mid-day blackout – automatic enforcement runs from smart-meter data plus neighbourhood patrols.
Bermuda is the most MWD-Level-1-friendly grass for SoCal lawns – set mower height to 1.5 inches and let summer dormancy set in rather than fight the schedule.
St. Augustine and tall fescue both brown noticeably under 2 days/week. Cut ¾ inch maximum on assigned days, raise mowing height to 3.5–4 inches, and hand-water mature trees with a shut-off nozzle on off-days.
Apply cycle-and-soak on slopes and clay soils: 3 minutes on, 20-minute pause, 3 minutes – SoCal clay sheds continuous spray inside 90 seconds.
Mulch ornamental beds 3 inches deep with arborist wood chips. Bare soil in inland SoCal loses 0.5 inch of moisture per day in May–September.
Replace overhead spray heads on narrow strips with subsurface drip – drip is exempt from day-of-week limits and uses 30–50% less water.
Fix broken or misaligned sprinkler heads within 48 hours. Visible runoff onto sidewalks and driveways is a same-day citation under California's permanent year-round baseline.
Stack rebates: SoCal Water$mart ($3/sq ft turf removal) plus your retail agency's local match brings most front-yard conversions to $4–$5/sq ft.
Install a WaterSense-labeled smart controller with a rain sensor – most SoCal retail agencies offer $80–$200 rebates and the controller pays back in one summer.
Skip your assigned cycle after 0.5 inch of rainfall in the prior 48 hours. California law requires rain sensors on any system installed after 1991.
Track weekly water use at ontarioca.gov/Utilities – Level 1's reduction target is 20% below 2020 baseline; meter-level alerts catch leaks before the bill arrives.
Ontario Water Restriction FAQs
What days can I water my lawn in Ontario?
What hours can I run my sprinklers in Ontario?
What are the fines for water violations in Ontario?
Can I install new sod or seed in Ontario during restrictions?
When will water restrictions end in Ontario?
Is this Ontario, California, or Ontario, Canada?
Ontario Airport / logistics hubs – industrial water rules?
Chino Basin groundwater – am I really under Colorado River shortage rules?
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