Can You Connect Downspouts to Sacramento Storm Drains? Code Rules for 2026

Short answer: in Sacramento, a downspout connected to a storm drain is almost always illegal unless you have a permit from the City of Sacramento Department of Utilities and an approved engineered connection. Roof runoff is allowed to reach the storm drain system eventually, but how it gets there matters. Sacramento City Code Chapter 13.16 treats any unpermitted pipe tied into the municipal separate storm sewer system (MS4) as an illicit connection, and enforcement can include fines, abatement orders, and stop-work notices on home sales.

Photo by Taylor Hammersla via Unsplash

How Sacramento’s Storm Drain System Actually Works

Sacramento runs what regulators call a municipal separate storm sewer system, or MS4. The storm drain system is separate from the sanitary sewer. Anything that enters a catch basin at the curb travels through pipes and, in most of the city, discharges straight into the Sacramento River, the American River, or one of the regional sloughs without treatment.

Because that water is effectively untreated, it is regulated under the federal Clean Water Act through an NPDES (National Pollutant Discharge Elimination System) permit issued by the Central Valley Regional Water Quality Control Board. The City of Sacramento holds that permit, and it is legally required to make sure only clean stormwater enters the system. That obligation is why the city passed Sacramento City Code Chapter 13.16, the local stormwater management ordinance, and why the Department of Utilities runs a stormwater quality program that inspects, investigates, and abates illicit connections.

From a homeowner’s perspective, this matters because the city cannot allow random private pipes plumbed into its infrastructure. Even if all you are sending down that pipe is clean roof rain, the city has no way to verify that without a permit and inspection, so the default answer is no.

What Counts as an Illicit Connection?

Sacramento City Code Section 13.16.070 prohibits illicit connections to the storm drain system. The term covers two different things, and homeowners often miss the second one.

• Any physical connection that carries non-stormwater into the MS4. Examples: a sump pump discharging groundwater into a storm drain, a graywater line, a pool backwash line, a floor drain from a garage, or an AC condensate line tied into an underground storm drain pipe.
• Any physical connection carrying only stormwater that was made without an approval or permit from the Department of Utilities. This is the category that catches downspouts. Even if the water is 100% clean roof runoff, the unpermitted pipe itself is the violation.

This second category surprises people. A homeowner says, “It is just rainwater, what’s the problem?” The problem is that the city is legally responsible for every pipe tied into its system. If they cannot document and inspect a connection, they have to treat it as non-compliant. That is also why sump pumps, even ones pumping groundwater, are commonly flagged during home inspections and code enforcement sweeps.

In our experience working on older Sacramento properties, the most common illicit connections we find are legacy ones: a downspout buried decades ago and tied straight into a clay storm line running to the curb, or a sump pump in a basement or crawlspace discharging through a hidden pipe. These were often installed by well-meaning homeowners long before the stormwater ordinance existed, but the current code still applies when the property changes hands or is reinspected.

Sacramento Stormwater Code Reference

Several code layers stack on top of each other when you are dealing with downspout drainage. Here is a consolidated reference for the ones most likely to apply to a single-family home in the City of Sacramento.

If you want the full breakdown of the plumbing-code side (sizing, setbacks, and WUI rules), read our companion piece on Sacramento gutter drainage code requirements. This article focuses on the stormwater layer, which is where most homeowners get tripped up.

Is It Illegal to Drain Gutters Into the Street in Sacramento?

This is the most common question we hear, and the answer is nuanced. Letting clean roof runoff flow across your yard, down your driveway, or through a sidewalk curb-face outlet into the street gutter is generally legal in Sacramento. The street gutter is designed to carry stormwater to the nearest catch basin. Roof rain is stormwater.

What is not legal:

• Piping a downspout directly into a catch basin or storm drain inlet.
• Piping a downspout into an underground storm drain line inside the public right-of-way without an encroachment permit.
• Creating a discharge that floods a neighbor’s property, undermines a sidewalk, or creates an icing hazard on the street.
• Sending anything other than rain through that path, including car-wash runoff, pool drain water, or pressure-washing residue.

Curb-face outlets (sometimes called sidewalk drains or through-curb drains) are the classic legal solution on Sacramento lots where the yard does not slope well. An underground PVC line runs from the downspout, under the sidewalk, and exits through a metal or plastic outlet installed in the curb face. The water drops into the existing street gutter. Because the pipe passes through the public right-of-way, you typically need an encroachment permit from the Department of Public Works, but the actual discharge point (the curb face) is not an illicit connection because it is not tied into the enclosed storm drain system.

For a deep dive on the hardware options and when to pick each one, see our guide on underground downspout drainage for Sacramento clay soil.

Penalties & Enforcement Timeline

Sacramento does not lead with fines. In most cases, the stormwater quality program investigates a complaint, documents the connection, and gives the property owner a written notice with a deadline to remove or permit the connection. If the owner cooperates, there is often no monetary penalty. Where enforcement escalates, Sacramento City Code Chapter 13.16 authorizes a stacking set of remedies.

In practice, the scenario that bites Sacramento homeowners hardest is not the direct fine. It is the unexpected discovery during a real estate transaction. A buyer’s inspector finds a downspout hard-piped into an old clay line heading toward the street, the title company flags it, and suddenly the seller is paying for trenching, removal, and a new code-compliant drainage system under deal pressure. We have seen this delay Sacramento closings by weeks. If you are selling soon, read our pre-listing gutter inspection guide before a buyer’s inspector does it for you.

Legal Ways to Drain Your Downspouts in Sacramento

Every one of these options keeps you on the right side of Sacramento City Code Chapter 13.16 and the IRC R903.4 5-foot foundation setback. The right choice depends on your lot slope, soil, roof area, and budget.

For a side-by-side comparison of the downstream hardware choices, our breakdown of French drain vs catch basin vs pop-up emitter gets specific about Sacramento clay soil performance, cost, and maintenance. If you are weighing splash blocks against buried drainage, our splash blocks vs pop-up emitters comparison breaks down the tradeoffs.

When You Need a Permit

Most on-property drainage work in Sacramento does not require a permit. The moment your work crosses into the public right-of-way or ties into public infrastructure, permits become mandatory.

1. Encroachment permit (Public Works): Required for any work in the sidewalk, curb, or street, including trenching under the sidewalk for an underground downspout line and installing a curb-face outlet.
2. Stormwater connection approval (Department of Utilities): Required for any physical tie-in to the storm drain system itself. This is rarely granted for a residential downspout because the on-site alternatives above are considered better engineering.
3. Building permit (Community Development): Generally not required for like-for-like gutter or downspout replacement, but can be triggered by major re-grading, retaining wall work, or ADU projects.
4. Historic review (if applicable): If your property is in a designated historic district (Midtown, Boulevard Park, Alkali Flat, East Sacramento landmark areas), visible exterior drainage changes can trigger additional review.

The easiest way to stay compliant: keep the work on your own property whenever possible, use splash blocks, pop-up emitters, or dry wells, and only reach for a curb-face outlet (with an encroachment permit) when on-site options will not drain the lot. For extra context on what licensed contractors should be telling you about these rules, see our guide to choosing a gutter contractor in Sacramento.

Frequently Asked Questions