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Personalized recommendations based on Boulder's actual water quality data
This page contains affiliate links. We may earn a commission at no extra cost to you. Our recommendations are based on your city's actual water quality data.
These are the contaminants your filter needs to address, ranked by how close they are to EPA limits.
| Contaminant | Detected Level | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
| Arsenic | 0.0014 mg/L | 0.01 mg/L | 14% | Safe |
| Fluoride | 0.5182 mg/L | 4 mg/L | 13% | Safe |
| Chromium | 0.0124 mg/L | 0.1 mg/L | 12% | Safe |
| Copper | 0.1094 mg/L | 1.3 mg/L | 8% | Safe |
| Nitrate | 0.7606 mg/L | 10 mg/L | 8% | Safe |
| Mercury | 0.0001 mg/L | 0.002 mg/L | 7% | Safe |
| Total Trihalomethanes | 4.0943 ug/L | 80 ug/L | 5% | Safe |
| Nitrite | 0.0504 mg/L | 1 mg/L | 5% | Safe |
Boulder's water quality is excellent — a basic filter for taste improvement is all you need.
Your water contains lead, arsenic, nitrates, fluoride — reverse osmosis is one of the most effective filtration methods for removing these specific contaminants. RO systems push water through a semipermeable membrane that blocks up to 99% of dissolved contaminants.
Your water quality is excellent — all tested contaminants are well within EPA limits. A basic carbon pitcher filter is all you need to improve taste by reducing chlorine and minor impurities.
Your water contains disinfection byproducts. Activated carbon filters use adsorption to trap these contaminants as water passes through the carbon media. They are highly effective at improving taste and removing organic chemicals.
Your water contains nitrates, which are particularly concerning for infants and pregnant women. Ion exchange filters swap harmful ions like nitrate for harmless ones like chloride, effectively reducing nitrate levels.
Our recommendations are based on city-wide data. For the most accurate results, test your home's specific water — contaminant levels can vary by neighborhood and plumbing age.
Get a Home Water Test KitCompare different filter types at a glance. Rows highlighted in blue are recommended for Boulder's water.
| Filter Type | Removes | Best For | Price | Maintenance |
|---|---|---|---|---|
| Pitcher Filter | Chlorine, taste, odor, some metals | Basic taste improvement, budget-conscious | $20 - $50 | Replace filter every 1-2 months |
| Faucet Mount | Chlorine, lead, some bacteria, VOCs | Convenient, no counter space needed | $20 - $80 | Replace filter every 2-3 months |
| Under-Sink Carbon | Chlorine, VOCs, PFAS, lead (certified models) | Families wanting better filtration without RO | $50 - $300 | Replace filter every 6-12 months |
| Reverse Osmosis | Lead, arsenic, PFAS, nitrates, fluoride, 99% of contaminants | Comprehensive contaminant removal | $150 - $600 | Replace filters annually, membrane every 2-3 years |
| Whole House | Chlorine, sediment, rust, VOCs, some metals | Filtering all water in the home | $300 - $1,500 | Replace filters every 6-12 months |
Boulder uses a mix of surface water and groundwater sources. This means your water may contain a broader range of contaminants — both the organic compounds common in surface water and the dissolved minerals found in groundwater. A versatile filtration system like reverse osmosis or a multi-stage filter is often the best approach for mixed-source water.
Boulder is served by 1 water system, serving a population of approximately 105,673 residents in Boulder County.
Boulder's water scores 94/100 — which is excellent. While your water meets all EPA standards, a basic carbon filter can still improve taste by removing residual chlorine. If you have specific health concerns or sensitive household members (infants, elderly, immunocompromised), a filter adds an extra layer of protection.
Based on Boulder's water quality data, the most important contaminants to filter are Arsenic, Fluoride, Chromium. We recommend a Reverse Osmosis System, which removes: Lead, Arsenic, PFAS/PFOA, Nitrates, and more. Different filter types target different contaminants, so choosing the right one depends on your specific water profile.
Since Boulder's water quality is excellent (94/100), an affordable pitcher filter ($20-$50) is all most residents need. Look for one certified to NSF/ANSI Standard 42 for chlorine taste and odor reduction. Brands like Brita or Clearly Filtered offer reliable, budget-friendly options.
For most Boulder residents, a whole house filter isn't strictly necessary since your water quality score is 94/100. An under-sink filter for your kitchen (for drinking and cooking water) is usually sufficient. However, a whole house filter makes sense if you want to reduce chlorine exposure during showers, protect your appliances from sediment, or have specific concerns about skin sensitivity to water chemicals.
Filter recommendations are based on publicly available water quality data from EPA and state regulatory databases. Individual water quality may vary based on your specific location within Boulder, the age and condition of your plumbing, and seasonal fluctuations. Always test your water for the most accurate results. The filter types recommended on this page are general guidance — specific product performance may vary. Consult with a water treatment professional for complex contamination issues.
Data last updated: 2026-02-03. Filter recommendations are reviewed quarterly.