1
At 18 GPG, Janesville's water qualifies as very hard. This can cause limescale in pipes and shorten appliance lifespan.
2
Chlorine levels may affect the taste of Janesville's tap water. A carbon filter improves flavor.

Score

73 /100

Moderate

"Good" threshold (70)

Janesville tap water is sourced from Groundwater deep wells and treated by City of Janesville Water Utility. Water hardness is very hard at 18.0 GPG which may cause scale buildup. TDS is 630 ppm which is above the EPA secondary guideline of 500 ppm. Overall purity score: 73/100 (Moderate). Updated for 2026.

Fix Your Water

Best filters matched to Janesville's 3 issues.

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MATCHED TO JANESVILLE'S WATER DATA

Best Water Filters for Janesville, WI (2026)

Matched to Very Hard Water (18 GPG), Moderate Chlorine in Janesville.

Very Hard Water (18 GPG) Moderate Chlorine

Best Overall #1 for Janesville

AFWFilters 5600sxt 48000 Grain Softener

Salt-Based Water Softener

$650-750

Why this fits Janesville

Handles Janesville's hard water (Very Hard Water (18 GPG))
Premium quality at $650-750

Pros & Cons +

48000 grain capacity handles very hard water

Digital metered valve saves salt

Requires salt refills monthly

Does not remove contaminants

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Best Value

Clearly Filtered Water Pitcher

Pitcher Filter

$80-95

Why this fits Janesville

Eliminates chlorine taste and odor from Janesville's water
NSF/ANSI 42 + NSF/ANSI 53 + NSF/ANSI 401 certified
Budget-friendly at $80-95

Pros & Cons +

No installation fill and pour

Removes 365+ contaminants including PFAS

Small capacity 2-3 people

Filter replacements every 4 months

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Best for Taste

Waterdrop 10UA Under-Sink Filter

Under-Sink Carbon Filter

$40-60

Why this fits Janesville

Eliminates chlorine taste and odor from Janesville's water
NSF/ANSI 42 certified
Budget-friendly at $40-60

Pros & Cons +

Very affordable

Easy DIY install no plumber

Does not remove PFAS or hardness

Single point of use only

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Also Recommended

Waterdrop G3P800 Tankless RO

Tankless Reverse Osmosis

$380-450

Why this fits Janesville

Eliminates chlorine taste and odor from Janesville's water
NSF/ANSI 58 + NSF 372 certified
Premium quality at $380-450

Pros & Cons +

No tank saves cabinet space

800 GPD fast flow rate

Higher upfront cost

Filter replacements are proprietary

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As an Amazon Associate, PurityMap may earn from qualifying purchases. Based on latest Janesville water data.

Full Filter Comparison for Janesville

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City data shows averages. Your home may differ.

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Janesville Water FAQ

Is Janesville WI tap water safe to drink in 2026?

Janesville tap water meets EPA federal drinking water standards and scores 73/100 (Moderate) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.

Does Janesville WI use chlorine or chloramine for disinfection?

Janesville uses chlorine as the primary disinfectant with a residual level of 1.2 ppm. Standard activated carbon filters including pitcher filters are effective at removing free chlorine taste and odor.

How hard is Janesville WI water and what is the TDS level?

Janesville water hardness is 18.0 grains per gallon (very hard) with a TDS of 630 ppm (unacceptable). This level causes noticeable scale buildup in water heaters kettles and dishwashers. A water softener is recommended to protect plumbing and reduce soap usage.

Has PFAS been found in Janesville WI drinking water?

Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Janesville drinking water.

What is the best water filter for Janesville?

Based on Janesville's water profile, we recommend the AFWFilters 5600sxt 48000 Grain Softener. Janesville has very hard water (18.0 GPG) and elevated chlorine. A whole-house carbon plus softener system handles both.

Nearby Reports

MadisonWisconsin — 58/100 Green BayWisconsin — 79/100 KenoshaWisconsin — 79/100 RacineWisconsin — 79/100 AppletonWisconsin — 79/100 OshkoshWisconsin — 79/100

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Data Sources

EPA SDWIS
EWG Tap Water Database
City of Janesville Water Utility CCR
USGS monitoring data

PurityMap compiles public data. Updated March 2026.

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