HAO Global Hard Water Project™

The map so far 💧

Aggregated, anonymized, city-level only. Every kit adds a data point. ✨

🔵 A–B gentle🟠 C hard🔴 D very hard⚪ home cities

Softer back home 🏙️ vs harder abroad — feel the difference.

estimated from public data unless marked 🧪

🌏 16 cities on the map · 100+ community tests so far — add yours and get ahead 💧

💧 Test my water

📍 Irvine
California, United States
F
⚖️ Avg pH
7.2
🪨 Hardness
375ppm
🏠 Homes
2
💭 Top concern
—
Updated 7/12/2026
📍 Costa Mesa
California, United States
F
⚖️ Avg pH
7.7
🪨 Hardness
625ppm
🏠 Homes
2
💭 Top concern
Dryness
Updated 7/22/2026
📍 Irvine
California, United States
D
⚖️ Avg pH
6.9
🪨 Hardness
563ppm
🏠 Homes
2
💭 Top concern
Dryness
Updated 7/12/2026
📍 Los Angeles
California, United States
D
⚖️ Avg pH
7.4
🪨 Hardness
563ppm
🏠 Homes
2
💭 Top concern
Frizz
Updated 7/12/2026
📍 Los Angeles
California, United States
F
⚖️ Avg pH
7.7
🪨 Hardness
1200ppm
🏠 Homes
2
💭 Top concern
Dryness
Updated 7/24/2026
📍 Rowland Heights
California, United States
F
⚖️ Avg pH
7.4
🪨 Hardness
1200ppm
🏠 Homes
2
💭 Top concern
Dryness
Updated 7/19/2026
📍 San Gabriel
California, United States
B
⚖️ Avg pH
7.6
🪨 Hardness
50ppm
🏠 Homes
1
💭 Top concern
Dryness
Updated 7/6/2026
📍 Temple city
California, United States
F
⚖️ Avg pH
7.6
🪨 Hardness
1200ppm
🏠 Homes
1
💭 Top concern
Dullness
Updated 7/7/2026
📍 Riverside
California, United States
D
⚖️ Avg pH
6.7
🪨 Hardness
375ppm
🏠 Homes
1
💭 Top concern
Color fading
Updated 7/7/2026
📍 Arcadia
California, United States
F
⚖️ Avg pH
8.2
🪨 Hardness
1200ppm
🏠 Homes
1
💭 Top concern
Frizz
Updated 7/8/2026
📍 Alhambra
California, United States
C
⚖️ Avg pH
7.6
🪨 Hardness
175ppm
🏠 Homes
1
💭 Top concern
Dryness
Updated 7/10/2026
📍 Montebello
California, United States
C
⚖️ Avg pH
8.2
🪨 Hardness
50ppm
🏠 Homes
1
💭 Top concern
—
Updated 7/25/2026

📍 Add Your City — Request a Kit