Is Auburn, ME Tap Water Safe to Drink?
Yes, Auburn tap water is safe to drink. Hardness is low at 18 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Auburn Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Auburn Compares
Auburn's water is 87% softer than the national average of 138 PPM - ranking in the bottom 95% for hardness nationwide. Most homes here do not need a softener. Within Maine, it ranks #4 of 8 cities (18% below the state average of 22 PPM). Among smaller cities, Auburn ranks #266 of 288 for hardness.
What Auburn's Water Means for Your Home
Hardness: 18 PPM - Low Concern
Auburn's water is slightly hard at 18 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Auburn is softer than 94% of US cities. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Lead levels deserve attention. At 6.2 ppb, Auburn is above the ideal of zero, though below the EPA action level of 15 ppb (dropping to 10 ppb in November 2027 under the Lead and Copper Rule Improvements). The lead typically comes from aging service lines or interior plumbing, not the treatment plant. A point-of-use filter certified for lead at the kitchen faucet is a practical safeguard, especially in older homes.
What's in the Treatment Process
Auburn's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 27.9 ppb (35% of the legal limit, but 186x the EWG guideline) and HAA5 at 22.3 ppb (37% of the legal limit, but 223x 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 0.0411 ppb, which is 2.1x 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) | 18 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 26 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 | 6.2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ⚠ Elevated |
| Chlorine / Chloramine | 0.6 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | Not reported | 5 mg/L | 10 mg/L | N/A |
How to Test Your Water in Auburn
Lead enters water from your home's plumbing, not the treatment plant — so Auburn's city-wide average of 6.2 ppb may not match your tap. Testing your specific faucet is the only way to know. Run cold water for 30 seconds before collecting a sample.
Free option: Request Auburn Water District's annual Consumer Confidence Report for official city-level data.
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About Auburn's Water Supply
Water Utility: Auburn Water District
Water Source: Lake Auburn (Surface Water)
Population Served: 17,245
Hardness: 18 PPM (1.1 grains per gallon)
Auburn's drinking water comes from surface sources — Lake Auburn. 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 17,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Auburn Water District'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 Auburn Water District in Auburn, ME, including ZIP codes:
03570, 03579, 03581, 03588, 03593, 03812, 03813, 03818, 03838, 03845, 03846, 03847, 03860, 04009, 04010, 04015, 04016, 04022, 04029, 04037, 04039, 04040, 04051, 04055, 04057, 04069, 04071, 04077, 04088, 04210, 04211, 04212, 04216, 04217, 04219, 04220, 04221, 04223, 04224, 04226, 04230, 04231, 04237, 04238, 04255, 04256, 04257, 04258, 04260, 04261, 04266, 04267, 04268, 04270, 04271, 04274, 04275, 04276, 04281, 04282, 04286, 04288, 04289, 04290, 04291, 04292
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Auburn to Other Maine Cities
Frequently Asked Questions About Auburn Water
Is Auburn tap water safe to drink?
Where does Auburn's water come from?
Do I need a water softener in Auburn?
What water filter is best for Auburn?
Is Auburn water safe for babies and infants?
What are disinfection byproducts in Auburn's water?
Is chromium-6 in Auburn's water?
Can I drink Auburn tap water straight from the faucet?
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 Auburn Homeowners Actually Buy
Common purchases for homes with 18 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Auburn's water data.