St. Louis MO Water Restrictions 2026

Current water restrictions in St. Louis, Missouri

St. Louis is currently under no active drought-emergency restrictions, but Missouri American Water enforces a mandatory seasonal watering schedule — limiting outdoor irrigation to 2 days per week from May 1 through September 30 each year.

Missouri American Water, which serves approximately 500,000 customers across the St. Louis metro area, draws its supply from the Missouri River and the Meramec River. The Missouri River is currently flowing at 82% of its normal volume, and St. Louis County is classified at D1 Moderate Drought status according to the U.S. Drought Monitor. These conditions are what keep the seasonal schedule in place even without a formal declared emergency.

The seasonal restriction program runs automatically each year without a separate emergency declaration — it activates May 1 and lifts September 30. Missouri American Water administers the program under its conservation guidelines, reachable at 314-621-5700 or at amwater.com/mo. At the state level, Missouri overall sits at normal drought status with no statewide water restrictions in effect.

Practically speaking: a resident with an even-numbered address can water their garden on a Wednesday morning before 10:00 AM — that is fully within the rules. That same resident cannot run sprinklers at 11:00 AM on Wednesday, and cannot water at all on a Tuesday. Watering outside the allowed hours between 10:00 AM and 6:00 PM is prohibited regardless of your assigned days. Hand watering with a shut-off nozzle and drip irrigation systems are both exempt from the day and hour restrictions.

St. Louis's watering days and hours

Your assigned watering days are determined by the last digit of your street address. Odd-numbered addresses — any address ending in 1, 3, 5, 7, or 9 — are assigned Tuesday and Saturday. Even-numbered addresses — ending in 0, 2, 4, 6, or 8 — water on Wednesday and Sunday. If you live at 4417 Gravois Avenue, your days are Tuesday and Saturday. If you live at 2840 Meramec Street, your days are Wednesday and Sunday.

Multi-family properties and commercial accounts follow the same address-based assignment using the building's primary street number. If a commercial property has multiple meters at different addresses, each meter's assigned days correspond to that meter's address number. Missouri American Water recommends that property managers post the schedule visibly for tenants and groundskeeping crews to avoid inadvertent violations.

St. Louis's urban tree canopy includes species that benefit from deep, infrequent watering concentrated within your allowed windows. Mature bur oaks (Quercus macrocarpa), a species native to Missouri bottomlands, develop deep taproots and tolerate some drought stress but benefit from a deep soak on each allowed watering day during July heat. Flowering dogwoods (Cornus florida), common in St. Louis residential yards, have shallow roots and suffer quickly under the D1 drought conditions currently affecting St. Louis County — prioritize them during your allowed morning window before 10:00 AM when soil absorption is highest. Eastern redbuds (Cercis canadensis), planted widely throughout city parkways and suburban lots, are similarly shallow-rooted and should be watered at the base, not overhead, to reduce stress during the restricted season.

Violation fines and enforcement

Missouri American Water issues citations directly to the account holder on record for the service address where the violation occurred. Enforcement relies on a combination of approaches: field patrols by conservation compliance staff during peak watering hours (roughly 10:00 AM to 6:00 PM), neighbor complaints submitted through the Missouri American Water customer service line at 314-621-5700, and — increasingly — consumption pattern analysis through smart meter data. Missouri American Water has expanded its advanced metering infrastructure (AMI) across the St. Louis service territory, which allows the utility to flag accounts showing high-volume usage spikes during prohibited midday hours even without a physical inspection.

If you receive a citation you believe was issued in error — for example, if you were hand-watering with a shut-off nozzle, or your new sod installation was within its 21-day variance window — you can contact Missouri American Water customer service at 314-621-5700 to request a review. Have your account number, installation date, and any registration confirmation for the establishment variance ready before you call. Complaints from neighbors are typically investigated within one to three business days.

Other outdoor water rules

Beyond lawn irrigation, Missouri American Water's seasonal conservation guidelines address several other outdoor water uses relevant to St. Louis homeowners and businesses.

• Vehicle washing at home: Permitted, but a hose with an automatic shut-off nozzle is required. Running an open hose on a driveway is not compliant.
• Commercial car washes: Exempt from residential day restrictions; facility-level commercial accounts are governed by their service agreement terms.
• Swimming pool filling and top-off: Allowed, but Missouri American Water asks customers to fill pools during early morning hours (before 10:00 AM) to minimize peak demand. Covers are strongly recommended to reduce evaporation during St. Louis's humid July and August weeks.
• Decorative fountains and water features: Should use recirculating pump systems. Single-pass water features that discharge to a drain are discouraged during D1 drought conditions.
• Pressure washing: No specific prohibition, but use of a shut-off nozzle is required. Allowing water to run continuously while setting up equipment is considered waste under Missouri American Water's conservation policy.
• Construction and dust control: Commercial construction accounts must comply with their individual service agreement; potable water use for dust suppression is subject to review during drought periods.

How St. Louis gets its water

St. Louis's drinking water comes primarily from two rivers: the Missouri River and the Meramec River. Missouri American Water operates the Treatment Plant at Florissant (serving north and central St. Louis County) and the Howard Bend Water Treatment Plant in Chesterfield, which draws from the Missouri River. The Meramec River serves as a secondary source, with infrastructure connecting Missouri American Water's southern service area to that watershed.

The Missouri River, which currently flows at 82% of its normal volume, is the workhorse of the regional supply. It carries water from as far as Montana and the Dakotas before reaching the St. Louis metro, but its flow is managed by the U.S. Army Corps of Engineers through a system of upstream mainstem reservoirs including Lake Sakakawea in North Dakota and Fort Peck Lake in Montana. When upstream releases are reduced or regional precipitation falls short, Missouri River flow at St. Louis drops — which is precisely what's reflected in the current 82% normal figure.

The Meramec River, a Missouri tributary that joins the Mississippi southeast of St. Louis, provides a localized backup supply. It is more sensitive to local rainfall deficits; St. Louis County's D1 Moderate Drought classification directly affects Meramec watershed recharge. Missouri American Water monitors both intake points continuously and adjusts treatment plant draws accordingly.

After intake, raw river water is treated at the Howard Bend and Florissant facilities using conventional coagulation, sedimentation, filtration, and disinfection processes before entering the distribution system. Missouri American Water publishes annual water quality reports for each treatment plant at amwater.com/mo, covering source water assessments for both the Missouri and Meramec intakes.

HOA and brown lawn protections

Missouri does not have a statute that explicitly prohibits HOAs from fining homeowners for brown or dormant lawns during declared water restrictions in the same way that Colorado, Florida, or California do. There is no Missouri equivalent of Colorado's CRS § 37-60-126 or Florida's FS § 720.3075. However, Missouri HOA covenants are subject to general reasonableness standards under Missouri common law, and courts have found that enforcement of appearance standards that would require a homeowner to violate a utility-mandated restriction can constitute an unreasonable covenant application.

If your HOA issues a notice or fine for a brown lawn or reduced irrigation during the Missouri American Water seasonal restriction period, you have a practical basis to push back in writing. Document that your watering schedule complies with Missouri American Water's mandatory 2-day-per-week restriction and that watering more frequently would put your account in violation of the utility's published conservation program.

Use this response template:

"Dear [HOA Board/Management Company]: I am writing in response to your notice dated [date] regarding the appearance of my lawn at [address]. My irrigation schedule is currently limited to [Tuesday/Saturday or Wednesday/Sunday], before 10:00 AM and after 6:00 PM, in compliance with the mandatory seasonal water restriction program administered by Missouri American Water (314-621-5700; amwater.com/mo). This program is in effect May 1 through September 30. Requiring additional irrigation to meet HOA appearance standards would place me in violation of my utility's enforceable conservation guidelines. I respectfully request that the HOA suspend any lawn-appearance enforcement during the active Missouri American Water seasonal restriction period."

Keeping your lawn alive on restricted water

St. Louis sits in the transition zone, where both cool-season and warm-season grasses can survive but neither is perfectly adapted. Understanding which grass you have determines how you allocate your two allowed watering days.

Tall Fescue is the most common residential lawn grass in St. Louis, and it benefits from mowing at 3.5 to 4 inches during the restricted season — taller blades shade the soil, reduce moisture loss, and protect shallow roots during the D1 drought period St. Louis County is currently experiencing. Water deeply on your two assigned days rather than lightly more often; a single application of 1 inch penetrates the root zone far more effectively than two shallow passes. Schedule your irrigation for the early morning window before 10:00 AM, when temperatures are lower and wind is calmer, to maximize absorption and minimize evaporation.

Bermudagrass and Zoysiagrass lawns — more common in south St. Louis County and areas with full sun exposure — are better suited to handle Missouri's hot, humid summers and will largely take care of themselves on a 2-day schedule as long as each watering session is thorough. For all grass types, avoid fertilizing with high-nitrogen products between July 1 and August 31; pushing growth during peak heat and restricted water increases stress rather than reducing it.

St. Louis water restriction FAQ

What days can I water if my St. Louis address ends in an odd number?

Odd-numbered addresses — any street number ending in 1, 3, 5, 7, or 9 — are assigned Tuesday and Saturday under Missouri American Water's seasonal schedule. You may water before 10:00 AM or after 6:00 PM on those days. You may not run sprinklers or irrigation on any other day of the week, including Monday, Wednesday, Thursday, Friday, or Sunday.

Can I water my new sod installation every day in St. Louis?

Yes, but you must register first. Missouri American Water offers a 21-day establishment variance for new sod and seed installations. Contact Missouri American Water at 314-621-5700 or at amwater.com/mo before or immediately after your sod is laid to register the property for the variance. Without registration, watering outside your assigned days and hours is a violation subject to a $50 first-offense fine.

Does Missouri American Water use smart meters to catch watering violations?

Yes. Missouri American Water has deployed advanced metering infrastructure (AMI) — commonly called smart meters — across its St. Louis service territory. These meters transmit hourly or near-real-time usage data to the utility, allowing staff to flag accounts with high consumption spikes between 10:00 AM and 6:00 PM when outdoor irrigation is prohibited. You do not need to be seen by a field inspector to receive a citation; anomalous usage patterns can trigger enforcement review.

Can I wash my car at home in St. Louis right now?

Yes, home vehicle washing is permitted under Missouri American Water's current guidelines, but you must use a hose with an automatic shut-off nozzle. Letting water run continuously from an open hose while soaping or rinsing a vehicle is considered waste and is not compliant with the utility's conservation policy. There is no assigned-day restriction for car washing — that restriction applies specifically to lawn and landscape irrigation.

What happens if my neighbor reports me to Missouri American Water for watering on the wrong day?

Missouri American Water investigates neighbor complaints, typically within one to three business days. A field representative may visit the property or the account may be reviewed using smart meter data. If a violation is confirmed, a $50 first-offense citation is issued to the account holder of record at that service address. A second violation within 12 months results in a $100 citation. To contest a citation you believe is incorrect, call 314-621-5700 and request a formal review.

Does Missouri American Water offer any rebates for replacing lawn turf in St. Louis?

Missouri American Water periodically runs WaterSense-aligned conservation programs and customer rebate opportunities through its Missouri service area. Check the current offerings at amwater.com/mo or call 314-621-5700 to ask specifically about turf replacement, irrigation controller upgrades, or WaterSense fixture rebates available in the St. Louis territory. Program availability and funding can change seasonally, so confirm current enrollment windows directly with the utility.

Is the Missouri River water safe to drink despite flowing at 82% of normal?

Yes. Missouri American Water's Howard Bend Water Treatment Plant in Chesterfield continuously monitors Missouri River intake quality and adjusts treatment protocols based on turbidity, seasonal algae levels, and flow conditions. Reduced river flow at 82% of normal affects supply planning and conservation policy — not treated water quality, which must meet all EPA Safe Drinking Water Act standards before entering the distribution system. Missouri American Water publishes annual water quality reports for each treatment plant on its website.

Are drip irrigation systems exempt from the St. Louis watering schedule?

Yes. Drip irrigation systems are fully exempt from both the assigned-day restriction and the 10:00 AM to 6:00 PM prohibited hours under Missouri American Water's seasonal program. The exemption applies because drip systems deliver water directly to the root zone with minimal evaporation loss, making them consistent with the utility's conservation goals. Hand watering with a hose equipped with an automatic shut-off nozzle is also exempt from day and hour restrictions.

What time can I water in St. Louis?

Watering is allowed Before 10:00 AM and After 6:00 PM. Watering outside these hours is a violation even on your assigned day.

What are the fines for watering violations in St. Louis?

First offense: $50 first · $100 second. Repeat violations: Missouri American Water issues $50 first-offense citations and $100 for second within 12 months.. Contact Missouri American Water for the full enforcement schedule.

When will water restrictions end in St. Louis?

Current No Active Restrictions restrictions are in effect through September 30 (annual seasonal). Monitor https://www.amwater.com/mo for the latest status.