EPA ID CO0116001 · checked 16 Oct 2026
Denver tap water: what EPA testing found
Denver Water (EPA record: DENVER WATER BOARD) serves 1,287,000 people in CO from surface water.
What the data shows
No PFAS above EPA’s limits, lithium below the screening level, and no health-based violations since 2016 in this data.
Lead from home plumbing (not in this data)
UCMR 5 does not test for lead, and lead usually enters water from service lines and plumbing inside buildings. Your utility’s lead service line inventory says whether your address is served by a lead line.
What fits: Lead comes from lead service lines, solder and fixtures inside buildings, not usually from the treatment plant. Use a filter certified for lead reduction (NSF/ANSI 53 or 58) at the tap you drink from.
Certified — IAPMO listing, checked 16 Oct 2026- Brita Elite Replacement Filter, formerly Longlast+Pitcher filter · OB06
- Culligan with ZeroWater Technology 10 Cup PitcherPitcher filter · ZEROP10
- PUR PLUS Lead Reducing Pitcher & Dispenser Replacement FilterPitcher filter · PPF951K
- ZeroWater 5-Stage Replacement FilterPitcher filter · ZR-017
- Culligan Scout 2.25 Gallon Gravity Countertop System with MaxClear…Countertop dispenser · MCSP
- PUR Faucet Filtration System, VerticalFaucet-mount filter · FM-3333B
- PUR PLUS Faucet Filtration System – Horizontal, ChromeFaucet-mount filter · PFM400H
- AquaTru Classic Countertop Reverse Osmosis Water PurifierCountertop reverse osmosis · AT2000
- Aquasana Claryum Direct Connect Under Sink Water FilterUnder-sink filter · AQ-MF-1
- Culligan EZ-Change Under Sink Drinking Water Filtration SystemUnder-sink filter · US-EZ-4
- Waterdrop 800 GPD Tankless Reverse Osmosis System - Waterdrop G3P800Under-sink reverse osmosis · WD-G3P800
- Waterdrop G3P600 Reverse Osmosis System - Waterdrop G3P600Under-sink reverse osmosis · WD-G3P600
Brand says certified — not found in IAPMO’s listing; check NSF- LifeStraw Home 7-Cup Glass Water Filter PitcherPitcher filter · LSH7SPC101 · check NSF’s listing yourself
- Aquasana Clean Water MachineCountertop dispenser · AQ-CWM2-B · check NSF’s listing yourself
- Brita Elite Advanced Water Filter Faucet System with Brita…Faucet-mount filter · FF-100 · check NSF’s listing yourself
- Brita Hub Countertop Water Filter System with Brita Hub FilterCountertop filter · 87340 · check NSF’s listing yourself
- Aquasana Claryum 2-Stage Under Sink Water FilterUnder-sink filter · AQ-6200 · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Max Flow Under Sink Water FilterUnder-sink filter · AQ-6300M · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Under Sink Water FilterUnder-sink filter · AQ-6300 · check NSF’s listing yourself
- A. O. Smith High Efficiency Reverse Osmosis SystemUnder-sink reverse osmosis · AOS-HERO-CHR · check NSF’s listing yourself
- APEC Water Tankless RO System 4 Stage Water Filter, 1000 GPD Reverse…Under-sink reverse osmosis · ROTL-A1000 · check NSF’s listing yourself
- APEC Water Ultimate 5-Stage 90 GPD High Output Reverse Osmosis Water…Under-sink reverse osmosis · RO-90 · check NSF’s listing yourself
- Aquasana SmartFlow Reverse Osmosis Water FilterUnder-sink reverse osmosis · AQ-SFRO2 · check NSF’s listing yourself
- Culligan Aquasential Smart Reverse Osmosis Drinking Water…Under-sink reverse osmosis · Aquasential Smart RO · check NSF’s listing yourself
- iSpring RCC7AK, NSF Certified 75 GPD, Alkaline 6-Stage Reverse…Under-sink reverse osmosis · RCC7AK · check NSF’s listing yourself
- Waterdrop X Series Reverse Osmosis System, X12Under-sink reverse osmosis · WD-X12 · check NSF’s listing yourself
NSF’s and WQA’s listings can’t be checked automatically; each product page also links to WQA’s.
PFAS and lithium (EPA UCMR 5)
450 results from 4 sampling points, 6 Mar 2023 to 21 Apr 2025. Averages count results below EPA’s reporting level as zero, as the PFAS rule does. Every number links to EPA’s UCMR 5 Data Finder (search PWSID CO0116001). Limits: EPA PFAS rule.
| Contaminant | Detected in | Highest result | Average | EPA limit |
|---|---|---|---|---|
| PFOA | 0 of 15 | not detected | 0 ng/L | 4 ng/L |
| PFOS | 0 of 15 | not detected | 0 ng/L | 4 ng/L |
| PFHxS | 0 of 15 | not detected | 0 ng/L | 10 ng/L* |
| PFNA | 0 of 15 | not detected | 0 ng/L | 10 ng/L* |
| HFPO-DA | 0 of 15 | not detected | 0 ng/L | 10 ng/L* |
| Lithium | 5 of 15 | 10.8 µg/L | 3.26 µg/L | none (screening level 10 µg/L) |
* PFHxS, PFNA and HFPO-DA limits (and the PFAS hazard index) are in the rule, but EPA proposed on 20 May 2026 to rescind them; not final as of 16 Oct 2026. UCMR 5 results are screening data, not compliance results: compliance uses quarterly running averages from 2029. Source file: EPA UCMR 5 occurrence data (dated 15 Oct 2026).
Health-based violations since 2016
None in EPA’s SDWIS data.
Source: EPA SDWIS via Envirofacts and the ECHO report for CO0116001, retrieved 16 Oct 2026.
Hardness
6.1 grains per gallon (average, 2025), from the utility’s water report checked 16 Oct 2026. Size a softener for this water.
Places and ZIP codes served
Denver, Littleton, Arvada, Aurora, Englewood, Golden, Westminster, Broomfield, Commerce City, Hudson, Lone Tree, Morrison, Parker, Watkins, Wheat Ridge.
80002 80003 80004 80005 80007 80010 80011 80012 80014 80019 80021 80022 80030 80031 80033 80110 80111 80112 80113 80120 80121 80122 80123 80124 80125 80126 80127 80128 80129 80130 80134 80137 80202 80203 80204 80205 80206 80207 80209 80210 80211 80212 80214 80215 80216 80218 80219 80220 80221 80222 80223 80224 80225 80226 80227 80228 80229 80230 80231 80232 80235 80236 80237 80238 80239 80246 80247 80249 80264 80265 80293 80294 80401 80403 80465 80642
ZIP codes the system reported to EPA for UCMR 5; place names from GeoNames (CC BY 4.0). A ZIP code can be split between systems.