Water Hardness in Pennsylvania (PA)
Pennsylvania has an average water hardness of 140 ppm (8.2 grains per gallon), which is classified as Moderately Hard . Water hardness at this level may cause noticeable scale buildup on fixtures and reduced soap lathering. Some Pennsylvania households choose to install a water softener or conditioner for improved water quality, though it is not strictly necessary. Water hardness varies between cities — from 95 ppm in Scranton to 200 ppm in Lancaster.
Water Hardness by City in Pennsylvania
The table below shows water hardness data for 8 cities in Pennsylvania, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Lancaster | 200 ppm | 11.7 gpg | Hard | Ground | 7.8 | 320 | City of Lancaster Water Department |
| Reading | 155 ppm | 9.1 gpg | Moderately Hard | Surface | 7.6 | 245 | Reading Area Water Authority |
| Allentown | 140 ppm | 8.2 gpg | Moderately Hard | Surface | 7.5 | 220 | Lehigh County Authority |
| Pittsburgh | 130 ppm | 7.6 gpg | Moderately Hard | Surface | 7.5 | 200 | Pittsburgh Water and Sewer Authority |
| Erie | 125 ppm | 7.3 gpg | Moderately Hard | Surface | 7.4 | 192 | Erie Water Works |
| Harrisburg | 120 ppm | 7 gpg | Slightly Hard | Surface | 7.4 | 185 | City of Harrisburg Water Bureau |
| Philadelphia | 110 ppm | 6.4 gpg | Slightly Hard | Surface | 7.4 | 170 | Philadelphia Water Department |
| Scranton | 95 ppm | 5.6 gpg | Slightly Hard | Surface | 7.2 | 145 | Pennsylvania American Water |
Understanding Water Hardness in Pennsylvania
Water Sources in Pennsylvania
The majority of cities in Pennsylvania draw their water from surface sources such as rivers, lakes, and reservoirs. Surface water generally contains fewer dissolved minerals than groundwater, which helps explain the overall hardness profile of the state. Cities that rely on surface water tend to have softer water because the water has less contact time with mineral-bearing rock formations underground.
Hardness Variation Across Pennsylvania
Water hardness in Pennsylvania ranges from 95 ppm in Scranton to 200 ppm in Lancaster — a difference of 105 ppm. This variation means that treatment recommendations differ significantly between cities. Residents of Lancaster and other cities with hard water should seriously consider installing a water softener to protect their homes. At 200 ppm, the annual cost of hard water damage to appliances, plumbing, and increased cleaning product usage can easily exceed $9. Scranton has the softest water in the state, though at 95 ppm it still contains some dissolved minerals.
Recommended Treatment for Pennsylvania Water
Based on the average water hardness of 140 ppm in Pennsylvania, a water softener is not strictly necessary, but some homeowners may prefer treated water. The most effective treatment options for Pennsylvania's water hardness level include:
- Salt-Based Water Softener ($800 - $2,500) — Removes hardness minerals. Highly effective.
- Salt-Free Water Conditioner ($1,000 - $3,000) — Conditions water without removing minerals. Moderately effective.
- Reverse Osmosis System ($200 - $500) — Removes hardness minerals. Highly effective.
- Electronic Descaler ($150 - $400) — Conditions water without removing minerals. Moderately effective.
How Pennsylvania Compares to Other States
Below is a comparison of Pennsylvania with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| Pennsylvania (PA) | 140 ppm | Moderately Hard | 8 |
| Kentucky (KY) | 130 ppm | Moderately Hard | 8 |
| Michigan (MI) | 150 ppm | Moderately Hard | 9 |
| District of Columbia (DC) | 120 ppm | Slightly Hard | 7 |
| Missouri (MO) | 160 ppm | Moderately Hard | 8 |
| New Jersey (NJ) | 120 ppm | Slightly Hard | 8 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in Pennsylvania, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.