Is Lawrence, MA Tap Water Safe to Drink?
Yes, Lawrence tap water is safe to drink. Hardness is low at 15 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Lawrence Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Lawrence Compares
Lawrence's water is 89% softer than the national average of 138 PPM - ranking in the bottom 97% for hardness nationwide. Most homes here do not need a softener. Within Massachusetts, it ranks #12 of 21 cities (21% below the state average of 19 PPM). Among cities (50k-100k), Lawrence ranks #252 of 258 for hardness.
What Lawrence's Water Means for Your Home
Hardness: 15 PPM - Low Concern
Lawrence's water is soft at just 15 PPM. That's good news for your plumbing, appliances, and skin. Scale buildup is a non-issue here, and a water softener would be a waste of money. Lawrence is softer than 97% of US cities. If you're thinking about water treatment in Lawrence, contaminant filtration is the place to invest.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Lawrence's water has TTHMs at 42.2 ppb and HAA5 at 27.6 ppb — both within legal limits, but the EWG health guidelines are far stricter. These byproducts form when chlorine reacts with organic matter during treatment. A whole-house activated carbon filter reduces both chlorine and its byproducts. Want the full picture? Request your utility's annual Consumer Confidence Report.
What's in the Treatment Process
Lawrence's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 42.2 ppb (53% of the legal limit, but 281x the EWG guideline) and HAA5 at 27.6 ppb (46% of the legal limit, but 276x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 0.0888 ppb, which is 4.4x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 15 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 30 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 6.1 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.4 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.34 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Good news for Lawrence residents. Your water quality is generally good. Most homes in this area do not need a water softener. If you have concerns about lead (especially in buildings constructed before 1986) or chlorine taste, a point-of-use filter is the most practical and cost-effective solution.
Quick Fix for Chlorine: Shower Filter
At 1.4 mg/L chlorine, many Lawrence residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in Lawrence
City-wide data is a solid starting point, but your specific tap might differ based on plumbing age, distance from the treatment plant, or seasonal changes.
Free option: Request City of Lawrence Water's annual Consumer Confidence Report for official city-level data.
📊 Already Tested Your Water?
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About Lawrence's Water Supply
Water Utility: City of Lawrence Water
Water Source: Merrimack River (Surface Water)
Population Served: 88,877
Hardness: 15 PPM (0.9 grains per gallon)
Lawrence's drinking water comes from surface sources — Merrimack River. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. On the upside, surface sources often deliver softer water than deep aquifers. The system serves 89,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Lawrence Water's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by City of Lawrence Water in Lawrence, MA, including ZIP codes:
01810, 01812, 01825, 01833, 01834, 01835, 01840, 01841, 01842, 01843, 01845, 01864, 01885, 01889, 01899, 01921, 01922, 01950, 01952, 01969, 01983, 01985, 05501, 05544
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Lawrence to Other Massachusetts Cities
Frequently Asked Questions About Lawrence Water
Is Lawrence tap water safe to drink?
Where does Lawrence's water come from?
Do I need a water softener in Lawrence?
What are disinfection byproducts in Lawrence's water?
Is chromium-6 in Lawrence's water?
Why does Lawrence water taste like chlorine?
Can I drink Lawrence tap water straight from the faucet?
What water filter is best for Lawrence?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Lawrence Homeowners Actually Buy
Common purchases for homes with 15 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Lawrence's water data.