How to improve and treat your tap water
In France, tap water is one of the most closely monitored food products: more than 300,000 samples are taken every year by the Regional Health Agencies. In the vast majority of municipalities it complies with regulatory limits and can be drunk with no additional treatment.
Wanting to "treat" your water is therefore rarely a health issue. It is usually about comfort: a strong chlorine taste, limescale damaging household appliances, or an old plumbing network of unknown condition. This guide explains, without alarmism, when equipment is genuinely useful, and when it is not.
InfoEau sells no equipment. Our comparisons and diagnostics rely solely on public data (French Ministry of Health, Anses, Hub'Eau) and are never influenced by commercial interests.
Why treat your water?
The chlorine taste
Chlorine is added deliberately to guarantee the absence of bacteria all the way to your tap. It is harmless at the doses used, but its taste and smell can be unpleasant. Simply leaving a jug in the fridge for an hour is often enough for it to disappear.
Removing the chlorine taste from waterLimescale (hard water)
Limescale comes from naturally dissolved calcium and magnesium. It is not a health hazard, it is even a useful mineral intake, but it scales up pipes, kettles and water heaters, and can dry out the skin.
Water too hard: what can you do?Nitrates
Mainly of agricultural origin, nitrates are monitored with a regulatory limit of 50 mg/L. Exceedances are rare and localised, mostly in intensive farming areas. Particular care applies to infants and pregnant women.
Nitrates in water: solutionsLead in older networks
Public lead pipes have been removed, but indoor connections remain in some buildings built before 1950. The limit is 10 µg/L. Letting the water run for a few dozen seconds after long stagnation greatly reduces exposure.
Lead in water: what can you do?The solutions, compared
No single device treats everything. Each technology addresses a specific problem, with running costs and limits you should know before buying.
The filter pitcher
- What it treats
- Chlorine taste, some metals and certain micropollutants depending on the cartridge.
- Who it is relevant for
- Households bothered only by taste, with drinking-water use only.
- Limits
- Does not durably remove limescale, nor nitrates. Cartridges must be replaced strictly on time to avoid bacterial growth.
The faucet filter
- What it treats
- Chlorine, tastes and odours, particles; some activated-carbon models also retain lead.
- Who it is relevant for
- Households wanting to filter larger volumes without handling a pitcher.
- Limits
- Reduced flow, regular maintenance, and highly variable performance depending on models and certifications.
Reverse osmosis
- What it treats
- Almost all dissolved substances: nitrates, pesticides, metals, mineral salts.
- Who it is relevant for
- Documented cases of persistent regulatory exceedance.
- Limits
- Expensive installation, significant water rejection, and removal of useful minerals. Rarely justified on a compliant network.
The water softener
- What it treats
- Hardness only: it exchanges calcium and magnesium for sodium.
- Who it is relevant for
- Very hard water areas (> 30 °f) where scaling genuinely damages equipment.
- Limits
- Improves neither health quality nor taste, increases sodium, and requires rigorous maintenance. Keeping one unsoftened tap for drinking is advised.
What if your water is already good?
If your municipality's analyses are compliant and the taste does not bother you, no equipment is needed. This is the most common case in France. Buying a filter "just in case" adds cost and maintenance with no measurable benefit.
How to know what you need
The right approach is to start from real data, not from an impression. InfoEau publishes, for each municipality, the official monitoring results: nitrates, pesticides, hardness, metals, overall compliance.
First check your municipality page, then the personalised diagnosis which cross-references your profile (infant, pregnancy, low-sodium diet) with your water composition.
Bottled water or filtration: the cost
Tap water costs about €0.004/L on average, versus €0.20 to €0.60/L for bottled water, a ratio of roughly 1 to 100. A filter pitcher adds a few cents per litre for cartridges, which remains far below bottled water.