Is Boulder North, CO Tap Water Safe to Drink?
Yes, Boulder North tap water is safe to drink. Hardness is low at 40 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Boulder North Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Boulder North Compares
Boulder North's water is 71% softer than the national average of 138 PPM - ranking in the bottom 76% for hardness nationwide. Most homes here do not need a softener. Within Colorado, it ranks #23 of 23 cities (60% below the state average of 99 PPM). Among mid-size cities (100k-200k), Boulder North ranks #149 of 189 for hardness.
What Boulder North's Water Means for Your Home
Hardness: 40 PPM - Low Concern
Boulder North's water is slightly hard at 40 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Boulder North is softer than 76% of US cities. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Boulder North's water has TTHMs at 29.6 ppb and HAA5 at 25.9 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
Boulder North's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 29.6 ppb (37% of the legal limit, but 198x the EWG guideline) and HAA5 at 25.9 ppb (43% of the legal limit, but 259x 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 0.171 ppb, which is 8.5x 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) | 40 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 70 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 0 ppt | — | No total limit | ✓ ND |
| ↳ 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 | 0.9 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.0167 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Good news for Boulder North 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.
How to Test Your Water in Boulder North
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 Boulder Water's annual Consumer Confidence Report for official city-level data.
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About Boulder North's Water Supply
Water Utility: City of Boulder Water
Water Source: Barker Reservoir + Silver Lake (Surface Water)
Population Served: 166,080
Hardness: 40 PPM (2.3 grains per gallon)
Boulder North's drinking water comes from surface sources — Barker Reservoir + Silver Lake. 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 166,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Boulder 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 Boulder Water in Boulder North, CO, including ZIP codes:
80301
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Boulder North to Other Colorado Cities
Frequently Asked Questions About Boulder North Water
Is Boulder North tap water safe to drink?
Where does Boulder North's water come from?
Do I need a water softener in Boulder North?
What are disinfection byproducts in Boulder North's water?
Is chromium-6 in Boulder North's water?
Can I drink Boulder North tap water straight from the faucet?
How does Boulder North compare to the Colorado average?
What water filter is best for Boulder North?
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.