Fresh water is a finite and increasingly contested resource, and the rules governing its use in a garden come from different levels: EU directives and regulations, national law, regional rules, temporary municipal ordinances and voluntary good practice. These are not the same thing and they do not bind the same people. This page keeps them apart, because the rule that almost always applies to someone watering a garden is the local one.
The Water Framework Directive (WFD 2000/60/EC) is the frame of European water legislation. It addresses member states, not individual citizens: it sets quality objectives for water bodies and asks that water pricing policies take account of cost recovery for water services, including environmental and resource costs. It is a pricing-policy principle aimed at states, and by itself it places no obligation on a garden owner.
Regulation (EU) 2020/741 sets minimum quality requirements for reusing treated wastewater for agricultural irrigation. It does not cover private garden watering, and it obliges no one to reuse treated water: it defines the technical conditions for those who do. It appears here because it is the European rule most often cited out of context in discussions about domestic water saving.
Garden use of mains water is regulated almost entirely at local level, and in several different forms: temporary municipal ordinances issued during the dry season that ban watering, car washing and pool filling within given hours; water utility regulations, which bind you by contract; and, in some regions, broader measures during a water crisis. Ordinances are temporary by definition and change from year to year and from town to town.
Penalties exist, but the amount is set by each individual measure and varies widely: there is no national schedule, and any generic figure would be made up. Before you design, check the ordinance in force in your municipality and your water utility's rules: they are the only texts that say what you may do in your garden, and the only ones that can change mid-season.
No technical choice makes a system "compliant" on its own: compliance depends on the local measure. These three, however, cut consumption and reduce the odds of being caught out by a restriction.
Some municipal regulations and some regional rules require a rain sensor on automatic systems; this is not a blanket national obligation, so it has to be checked locally. Obligation aside, it is the simplest countermeasure to a system that starts up while it is raining. SprinklerMap helps you plan the sensor into the design.
Some ordinances grant exemptions for drip or low-flow systems, others ban any mains draw for irrigation at all: this is not a general rule and has to be read in the text of the measure. Technically, drip delivers water to the root instead of into the air, so it loses less to evaporation and drift than overhead spray — which is why it is often treated differently. Using SprinklerMap to design drip lines on beds, separate from the lawn, leaves you more room if a partial restriction arrives.
A storage tank reduces dependence on the mains, which is the variable bans and rationing actually act on. Sizing is estimated from roof area and local average rainfall; for garden use, local rules on storage and reuse still need checking, as some municipalities have them.
Weather-connected controllers adjust run times to actual evapotranspiration (see the Technical Guide) and cut waste. They remain an efficiency tool, not a regulatory pass: if an ordinance bans watering within certain hours, the ban applies to a smart system too. A precise design — flow rates, precipitation rate, separate zones — is the prerequisite for any automation to work.
In short: the rules that affect you are almost always local and temporary, the European framing explains the context but imposes nothing on you directly, and the soundest design choice is to cut consumption and dependence on the mains. When in doubt, the text to read is your municipality's and your utility's.