Boston MA Water Restrictions 2026

Current water restrictions in Boston, Massachusetts

Boston is currently under a 3-days-per-week outdoor watering schedule declared by the Massachusetts Water Resources Authority (MWRA), triggered by a Drought Level 2 (Significant) declaration issued in September 2025 after combined storage at Quabbin Reservoir and Wachusett Reservoir dropped to 68% of capacity.

The MWRA — which supplies drinking water to Boston and 59 other Greater Boston communities serving approximately 2.5 million people — activated its Drought Level 2 protocols when reservoir levels fell to their lowest point since 2016. Quabbin, located in central Massachusetts near Belchertown, and Wachusett, near Clinton, together form the backbone of the MWRA surface water supply. A combined 68% storage reading crossed the threshold that triggers mandatory outdoor water use restrictions system-wide.

At the state level, Massachusetts's overall drought status is currently listed as normal, meaning local conditions in the MWRA service area are more stressed than the statewide average. The MWRA operates independently of the state's general drought index when its own reservoir metrics trigger action.

Practically speaking: a Boston resident cannot water their garden on a Wednesday at all — Wednesday is eliminated under Drought Level 2 protocols. On permitted days, watering is restricted to before 9:00 AM or after 5:00 PM. A resident with an odd-numbered street address who wants to run their sprinkler on a Saturday morning must finish before 9:00 AM. Running the system at 10:00 AM on any permitted day, or watering on Wednesday regardless of address, both constitute violations subject to a $250 fine. The current schedule is projected to remain in effect through Quabbin and Wachusett recovery, with a target recovery date of Fall 2026.

Your assigned watering schedule

Address assignment follows the street number of the property. A home at 47 Commonwealth Avenue is odd-numbered and waters Monday, Thursday, and Saturday. A building at 120 Tremont Street is even-numbered and waters Tuesday, Friday, and Sunday. When in doubt, use the number displayed on your property or listed in the City of Boston Assessing Department's records.

Multi-family properties and commercial parcels use the official street number associated with the primary entrance on file with the city. Condominium associations in buildings like those in the South End or Back Bay should confirm their MWRA account address with their property manager, since automated irrigation systems are often registered under a separate service address that may differ from individual unit numbers.

Boston's urban tree canopy includes species that are particularly sensitive to drought stress during dry summers: American elm (Ulmus americana), widely replanted along Commonwealth Avenue; red maple (Acer rubrum), common in neighborhood streetscapes from Jamaica Plain to Dorchester; and littleleaf linden (Tilia cordata), planted extensively along the Rose Kennedy Greenway. These trees benefit from deep, slow watering at the root zone during permitted hours — drip irrigation or a slow-release soaker is exempt from hourly restrictions and is the most effective method during Drought Level 2 conditions.

Fines and penalties

Enforcement is conducted at the municipal level within the MWRA service area. Boston Water and Sewer Commission (BWSC) inspectors respond to complaints submitted through the City of Boston's 311 service line, and patrols are conducted in neighborhoods with documented high water use. The MWRA also monitors aggregate demand data through its metering network — unusual consumption spikes at a service address during prohibited hours can flag an account for follow-up inspection. Smart meter deployment across Boston's distribution system allows BWSC to pull hourly interval data without requiring a site visit.

Violations are issued per occurrence, not per day, meaning a multi-zone sprinkler system running during prohibited hours could generate multiple $250 citations in a single morning. Residents who believe a citation was issued in error may appeal through the Boston Water and Sewer Commission at 980 Harrison Avenue, Roxbury, or by contacting the MWRA directly at mwra.com or 617-242-6000. The MWRA does not publicize a formal timeline for appeal responses, but Boston municipal code violation appeals are typically scheduled within 21 days of written request.

Other outdoor water rules

Under MWRA Drought Level 2, restrictions extend beyond lawn and garden irrigation. The following activities are either prohibited, conditional, or modified:

• Vehicle washing: Washing cars, trucks, or motorcycles at home with a running hose is prohibited. Commercial car washes that recycle water are permitted. Hand-washing with a bucket and shut-off nozzle is allowed.
• Pressure washing: Residential pressure washing of driveways, sidewalks, and building exteriors is prohibited unless required for health or safety purposes — Boston's dense triple-deckers and rowhouses make this a frequent point of confusion.
• Pool filling: Initial filling of new swimming pools is restricted. Topping off existing pools to compensate for evaporation is permitted but should be done incrementally and only during permitted irrigation hours as a best practice.
• Decorative fountains: Operation of ornamental and decorative fountains that do not recirculate water is prohibited. Recirculating systems may continue.
• Construction water use: Contractors using municipal water for dust suppression or concrete curing on permitted projects must comply with MWRA-issued construction water use guidelines — contact BWSC at 617-989-7000 for project-specific guidance.
• Restaurant and food service: Automatic sidewalk or patio rinsing systems must be shut off. Table water served only upon request is encouraged but not currently mandated at Drought Level 2.

Boston's water supply and source

Boston's water supply is drawn entirely from two large surface water reservoirs managed by the Massachusetts Water Resources Authority: Quabbin Reservoir in central Massachusetts and Wachusett Reservoir in central Worcester County. Together they hold approximately 412 billion gallons at full capacity and supply water to Boston and 59 MWRA member communities.

Quabbin, completed in 1946 and located near Belchertown in the Swift River watershed, is the larger of the two — it is among the largest unfiltered surface water supplies in the United States. Water flows from Quabbin eastward through the Cosgrove Tunnel, a 17-mile underground aqueduct completed in 1930, to Wachusett Reservoir near Clinton, Massachusetts. From Wachusett, water travels through the Metro Tunnel and distribution mains to reach Boston and surrounding communities.

Treatment occurs at the John J. Carroll Water Treatment Plant in Marlborough, Massachusetts, which opened in 2005 and handles the bulk of MWRA supply treatment. The facility uses ozonation, biofiltration, and ultraviolet disinfection in addition to chlorination and fluoridation. A secondary facility, the Cosgrove Tunnel bypass infrastructure and the Spot Pond Storage facility in Stoneham, provides additional operational flexibility during peak demand.

Boston has no significant groundwater or aquifer component in its municipal supply — the system is almost entirely dependent on Quabbin and Wachusett precipitation and runoff from their protected watershed lands. The MWRA owns and protects approximately 117,000 acres of watershed land in central Massachusetts to prevent contamination and maintain water quality. When both reservoirs drop below 75% combined capacity, MWRA drought protocols activate, and the September 2025 drop to 68% represented the most significant storage deficit the system has seen since drought conditions in 2016.

HOA rules during water restrictions

Massachusetts does not have a dedicated statute equivalent to Colorado's CRS § 37-60-126 or Florida's FS § 720.3075 that explicitly prohibits homeowners associations from fining residents for brown or dormant lawns during declared drought restrictions. However, under general Massachusetts common law and the MWRA's drought authority, HOA enforcement actions that conflict with a state or regional water authority's mandatory use restrictions are legally subordinate to those restrictions.

In practice, if an HOA in Newton, Brookline, or a Boston condominium association attempts to fine a resident for a brown lawn or for failing to irrigate during a period when the MWRA has restricted outdoor watering, the resident has a reasonable defense that compliance with MWRA Drought Level 2 protocols precludes compliance with the HOA landscaping standard. Residents should document all MWRA communications and keep a copy of the restriction notice for their records.

If you receive an HOA violation notice for a dormant or brown lawn during the current Drought Level 2 restriction period, consider sending the following to your HOA board:

"This notice is to inform the association that the Massachusetts Water Resources Authority (MWRA) has declared Drought Level 2 (Significant) restrictions, limiting outdoor irrigation to three designated days per week with no watering permitted on Wednesdays or between 9:00 AM and 5:00 PM on any day. My lawn's current condition is a direct result of compliance with mandatory MWRA Drought Level 2 protocols. I respectfully request that this violation notice be withdrawn and that no fine be assessed while MWRA drought restrictions remain in effect."

For additional legal support, contact the Massachusetts Attorney General's Consumer Protection Division or consult the MWRA directly at 617-242-6000.

Lawn survival guide for Boston

Boston's climate is cool-humid, placing it firmly in the cool-season grass zone. The grasses grown on Boston-area lawns are high-water-demand cool-season species that go semi-dormant under drought stress but recover with autumn rain. The following table covers the grasses you are most likely to have:

Under the current 3-days-per-week schedule, the most effective approach for Boston lawns is to water deeply and infrequently rather than shallowly on every permitted day. Apply at least 0.75–1.0 inch per session during your allotted early morning window (before 9:00 AM is ideal to minimize evaporation loss, which runs high during Boston's humid July and August afternoons). If your lawn is primarily Kentucky Bluegrass or Perennial Ryegrass and has gone tan and dormant, do not panic — both species are designed to survive 4–6 weeks of dormancy and will green up when cooler, wetter conditions return in September and October.

Mowing height matters significantly during drought stress. Raise your mower deck to 3.5–4 inches for all cool-season grass types; taller blades shade the soil, reduce surface evaporation, and maintain deeper root systems. Avoid fertilizing with high-nitrogen products between June and August — pushing top growth while roots are stressed accelerates decline. If your lawn contains a Fine Fescue component (common in shadier Boston yards, particularly under red maple and linden canopies), it will outperform the rest of the lawn during Drought Level 2 and should be encouraged in any reseeding you do this fall.

Frequently asked questions

What days can I water at my Boston address right now?

It depends on whether your street number is odd or even. Odd-numbered addresses (1, 3, 47, 113, etc.) are permitted to water on Monday, Thursday, and Saturday before 9:00 AM or after 5:00 PM. Even-numbered addresses (2, 4, 120, 200, etc.) are permitted on Tuesday, Friday, and Sunday during the same hours. No address may water on Wednesday. If you are unsure of your official street number, check the City of Boston Assessing Department's property lookup tool at boston.gov/departments/assessing.

Can I water my lawn on a Wednesday in Boston?

No. Wednesday is a complete irrigation blackout day under MWRA Drought Level 2 restrictions. This applies to all addresses — odd and even — across all 60 MWRA member communities including Boston, Cambridge, Newton, Somerville, and Brookline. Running any automatic irrigation system on a Wednesday is a violation subject to a $250 fine per occurrence.

The MWRA declared Drought Level 2 — how serious is that, and how long will restrictions last?

Drought Level 2 (Significant) is the second of four stages in the MWRA drought response framework. It was triggered in September 2025 when combined Quabbin and Wachusett reservoir storage fell to 68% — the lowest level since 2016. The MWRA has indicated restrictions will remain in place through reservoir recovery, with a target return to normal conditions by Fall 2026, contingent on precipitation refilling Quabbin and Wachusett to acceptable levels. Check current reservoir storage at mwra.com.

Does the MWRA or Boston Water and Sewer Commission use smart meters to detect violations?

Yes. The Boston Water and Sewer Commission has deployed automated meter infrastructure (AMI) across much of its service area that records water use in hourly intervals. This data can identify unusually high consumption at a specific address during prohibited irrigation hours (9:00 AM–5:00 PM) without a physical inspection. High-use outliers can be flagged for follow-up enforcement visits. This means running your sprinkler at noon — even once — can generate a detectable consumption signature.

My new sod was just installed. Do I have to follow the 3-day schedule?

Not immediately. The MWRA allows a 21-day establishment variance for newly installed sod or seeded areas. You must register for the variance with the Massachusetts Water Resources Authority by calling 617-242-6000 before you begin daily establishment watering. Once your 21-day window closes, normal Drought Level 2 restrictions apply to the area. Keep documentation of your installation date and variance registration in case of an enforcement inquiry.

Can I wash my car at home in Boston during Drought Level 2?

Not with a running hose. Home vehicle washing with a continuously running hose is prohibited under MWRA Drought Level 2 restrictions. You may use a bucket and a hose with a shut-off nozzle, which qualifies as hand-washing and is permitted. Commercial car washes that recycle their water are fully operational and are actually a more water-efficient option than home washing under any conditions.

Does Boston offer rebates for replacing turf with drought-tolerant landscaping?

The MWRA offers a residential and commercial WaterSmart program that has historically included rebates for WaterSense-labeled irrigation controllers, rain sensors, and soil moisture sensors. Turf removal rebates have been offered on a pilot basis in some MWRA member communities. Contact the MWRA's Water Efficiency department at 617-242-6000 or visit mwra.com to confirm current rebate availability under the active Drought Level 2 declaration — programs sometimes expand when reservoir levels are at stress thresholds.

I live in Cambridge — do these same rules apply to me?

Yes. Cambridge is a full MWRA member community and is subject to identical Drought Level 2 restrictions. The same odd/even address schedule, Wednesday prohibition, and 9:00 AM–5:00 PM watering ban apply. Cambridge Water Department enforces locally and issues its own $250 citations. The same is true for Somerville, Newton, Brookline, and all 60 MWRA service communities — the rules are uniform across the entire regional system because Quabbin and Wachusett supply all of them from the same shared reservoirs.

What time can I water in Boston?

Watering is allowed 5am-9am only (when active). Watering outside these hours is a violation even on your assigned day.

What are the fines for watering violations in Boston?

First offense: Written warning. Repeat violations: Fines per city ordinance. Contact Boston Water and Sewer Commission (BWSC) for the full enforcement schedule.

When will water restrictions end in Boston?

Current Seasonal Outdoor Water Use Restrictions restrictions are in effect through September 30 (seasonal; drought can trigger additional restrictions). Monitor https://www.bwsc.org for the latest status.

Can I hand water during Boston water restrictions?

Yes. Hand watering with a hose fitted with a shut-off nozzle is generally allowed on any day during permitted hours. Drip irrigation and soaker hoses are also typically exempt from the day-of-week schedule. Confirm specifics with Boston Water and Sewer Commission (BWSC).

How do I report a water waste violation in Boston?

Contact Boston Water and Sewer Commission (BWSC) at 617-989-7000 or visit https://www.bwsc.org. Most utilities accept online reports and respond within 48 hours.