Cologne Water Billing: Why RheinEnergie and StEB Send You Two Different Bills
RheinEnergie only bills you for fresh drinking water (Trinkwasser), not for wastewater, even though the same company handles your electricity and gas too. Your water bill combines a Grundpreis, tiered by how many dwelling units are in your building (a flat rate per building up to 50 units, then a per-unit rate above that), with a Mengenpreis of roughly 1.29 EUR per cubic meter including VAT. Wastewater (Abwasser) is a completely separate bill from StEB Köln (Stadtentwässerungsbetriebe Köln), calculated from the same fresh water volume RheinEnergie reports to them: a Schmutzwassergebühr of 1.76 EUR per cubic meter in 2026 (up from 1.63 EUR in 2025), plus a Niederschlagswassergebühr of 1.39 EUR per square meter of sealed surface for stormwater drainage. You submit your own meter reading online through RheinEnergie's OnlineService, and your first annual water bill (Jahresrechnung) arrives after your first scheduled meter reading date, which can land before a full calendar year has actually passed since move-in.
The Official Rule
Here’s the detail that surprises a lot of newcomers, even ones who already know RheinEnergie supplies their electricity, gas, and water in Cologne: RheinEnergie’s water bill covers only fresh drinking water (Trinkwasser). Wastewater, Abwasser, is billed entirely separately by a different organization: StEB Köln (Stadtentwässerungsbetriebe Köln).
Two Utilities, Two Bills
| Service | Who bills you | What it covers |
|---|---|---|
| Trinkwasser (fresh water) | RheinEnergie | Water supplied into your home, Grundpreis + Mengenpreis |
| Schmutzwasser (wastewater) | StEB Köln | Drainage, calculated from your fresh water consumption reported by RheinEnergie |
| Niederschlagswasser (stormwater) | StEB Köln | Rainwater drainage, calculated by sealed surface area, not consumption |
The wastewater figure isn’t independently metered, StEB Köln’s own billing guidance confirms it’s calculated from the fresh water volume that RheinEnergie already reports to them, so you don’t submit anything separately for this part.
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What RheinEnergie’s Bill Covers
Your fresh water bill from RheinEnergie combines two components, per RheinEnergie’s own pricing FAQ: a Grundpreis, tiered by the number of dwelling units in your building (a flat rate per building for up to 50 units, then a per-unit rate above that threshold), and a Mengenpreis of roughly 1.29 EUR per cubic meter, including 7 percent VAT. RheinEnergie also supplies fresh water beyond Cologne itself, into Pulheim and Frechen, drawing from eight waterworks on both sides of the Rhine, plus an additional works in Kerpen-Türnich specifically serving Frechen.
What StEB’s Bill Covers
| Fee | 2025 rate | 2026 rate |
|---|---|---|
| Schmutzwassergebühr (per m3 wastewater) | 1.63 EUR | 1.76 EUR |
| Niederschlagswassergebühr (per m2 sealed surface) | 1.32 EUR | 1.39 EUR |
The Schmutzwassergebühr scales with your fresh water consumption. The Niederschlagswassergebühr is different in kind, it’s calculated from the sealed or built-up surface area on your property (roofs, paved driveways, anything channeling rain into the public sewer), not from how much water you use, so it shows up on your bill regardless of your actual consumption that period. StEB’s billing period runs from September two years prior through August of the previous year, and statements are issued annually through Cologne’s Steueramt (tax office).
Meter Readings and Your First Bill
You submit your own meter reading through RheinEnergie’s OnlineService at onlineservice.rheinenergie.com/zaehlerstand. Your first Jahresrechnung (annual bill) arrives after your first scheduled reading date, which follows the local network operator’s own reading cycle rather than your personal move-in anniversary, so it can land before a full 12 months have actually passed since you moved in. Check the billing period printed on the invoice itself rather than assuming it covers exactly one year.
Step by Step
- Register your move-in with RheinEnergie, the same registration that covers electricity and gas also sets up your water account.
- Submit your meter reading online through RheinEnergie’s OnlineService whenever requested, rather than waiting for a paper reminder.
- Expect your first Jahresrechnung to arrive on RheinEnergie’s reading schedule, not exactly 12 months after your move-in date.
- Understand your StEB wastewater bill is separate and automatic, it’s calculated from the fresh water figure RheinEnergie already reports, no extra submission needed from you.
- Check whether your property has a Niederschlagswassergebühr line, based on sealed surface area, this applies independent of your water consumption.
- Don’t shop around for a cheaper water provider, water supply in the RheinEnergie service area runs as a structural monopoly, unlike electricity and gas.
Compliance Note
This page explains general practice around water and wastewater billing in Cologne, but it is not financial or legal advice, and specific fees and billing cycles can change. For your specific situation, confirm current details directly through RheinEnergie for water supply and StEB Köln for wastewater and stormwater fees.
FAQ & Common Pitfalls
Why do I get two separate bills for what feels like one utility?
Because two different organizations handle two different parts of your water service. RheinEnergie supplies and bills you for fresh drinking water coming into your home, that's the Trinkwasser side. Stadtentwässerungsbetriebe Köln (StEB), a separate public utility, handles wastewater drainage and billing, the Abwasser side. Even though RheinEnergie already handles your electricity and gas under one roof, water splits into these two organizations specifically because supply and drainage are structurally different services in Cologne.
If StEB handles wastewater, how do they know how much I actually used?
They don't measure it separately, RheinEnergie reports your fresh water consumption directly to StEB, and your wastewater bill is calculated from that same figure. The logic is straightforward, water that goes into your home largely goes back out through the drains, so your fresh water usage becomes the basis for your Schmutzwassergebühr. You don't need to submit anything separately to StEB for this part, the data transfer happens between the two utilities.
What's this separate stormwater charge about?
The Niederschlagswassergebühr, 1.39 EUR per square meter in 2026, covers rainwater drainage from sealed or built-up surfaces on your property, roofs, paved areas, driveways, anything that channels rain into the public sewer system rather than letting it soak into the ground. This is calculated by surface area, not water consumption, so it applies even in a month where you used very little tap water, and it's a separate line from the consumption-based Schmutzwassergebühr.
How does RheinEnergie's Grundpreis actually work for an apartment building?
It's based on how many dwelling units (Wohneinheiten) are in your building, not on your individual meter or apartment size. Buildings with up to 50 units pay a flat rate for the whole building, while buildings with more than 50 units pay per unit above that threshold. If you live in a large apartment building, this Grundpreis is typically split among residents by your landlord or property management as part of your Nebenkosten, rather than billed to you individually by RheinEnergie.
When does my first water bill actually arrive?
After your first scheduled meter reading date (Ablesetermin), and this can land before a full year has passed since you moved in, since RheinEnergie's reading schedule follows the local network operator's timing rather than your specific move-in anniversary. Don't assume you'll get exactly 12 months of usage on your first bill, check the actual billing period stated on the invoice itself.
Can I switch to a different water provider to get a better rate?
No. Unlike electricity and gas, where you can shop around for a cheaper Sondervertrag, water supply in Cologne, Pulheim, and Frechen runs through RheinEnergie as a structural monopoly, there's no competing water provider to switch to. The only real lever you have is reducing consumption itself, since both your RheinEnergie water bill and your StEB wastewater bill scale with how much fresh water you actually use.