What's in Arvada, CO tap water

20 contaminants were measured in the Arvada, CO water system's 2024 annual report. Each is shown below against its federal limit.

Browse the mapFull source report ↗

Reporting year: 2024
Contaminants measured: 20
Over federal limit: 0
Approaching the limit: 0
Service area: CO
Source: Utility CCR

All within federal limits. Every measured contaminant in this report is below its federal threshold.

Where your water comes from · EPA SDWIS

Arvada, CO's drinking water comes from surface water, drawn from 3 sources.

Source

3surface water

RALSTON RESERVOIR
ARVADA RESERVOIR
CLEAR CREEK DIVERSION

Treatment

4treatment plants

RALSTON TP
ARVADA TP
RALSTON TP CFE
+ 1 more

Distribution

14storage units

Source: EPA SDWIS facilities inventory. Methodology.

Compliance history

Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.

Treatment technique violationHealth-based
1 violation on record · most recent Sep 2013
resolved

Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.	46.2 ug/LAverageSystem-wide	None set	Within the limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.	31.4 ug/LAverageSystem-wide	None set	Within the limit

Other

Contaminant	Measured	Federal limit	Status
Chlorine Free	0.95 mg/LAverageSystem-wide	None set	Within the limit

Metals

Contaminant	Measured	Federal limit	Status
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	3.1 ug/L90th percentileAt the tap	None set	Within the limit
CopperA metal that enters water from corroding household plumbing.	0.11 mg/L90th percentileAt the tap	1.3 mg/LAction level	Within the limit
BariumA metal from erosion of natural deposits and industrial discharge.	0.031 mg/LAverageArvada WTP	2 mg/LMCL	Within the limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg0.031 mg/Lrange0.024–0.039 mg/L2% of limit Ralston WTPPlant avg0.024 mg/Lrange0.021–0.028 mg/L1% of limit
AluminumA common element sometimes used as a treatment coagulant.	0.021 mg/LAverageRalston WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg0.02 mg/Lrange0.016–0.024 mg/L Ralston WTPPlant avg0.021 mg/Lrange0.02–0.023 mg/L
LithiumA naturally occurring element found in some groundwater.	9.6 ug/LAverageArvada WTP	None set	Detected — no federal limit
ManganeseA naturally occurring metal from soil and rock.	0.005 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg0.005 mg/Lrange0–0.008 mg/L Ralston WTPPlant avg0 mg/Lrange0–0 mg/L
SodiumA naturally occurring salt component.	16 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (3)— Potential Effects, Arvada WTP, Ralston WTP Potential EffectsPlant Arvada WTPPlant avg16 mg/Lrange11–24 mg/L Ralston WTPPlant avg7 mg/Lrange6.1–8.3 mg/L

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.56 mg/LAverageArvada WTP	4 mg/LMCL	Within the limit
+By source (2)— Ralston WTP, Arvada WTP Ralston WTPPlant avg0.52 mg/Lrange0.13–0.66 mg/L17% of limit Arvada WTPPlant avg0.56 mg/Lrange0.27–0.66 mg/L17% of limit
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.	0.19 mg/LAverageRalston WTP	10 mg/LMCL	Within the limit
+By source (2)— Ralston WTP, Arvada WTP Ralston WTPPlant avg0.19 mg/Lrange0–0.48 mg/L5% of limit Arvada WTPPlant avg0.08 mg/Lrange0–0.17 mg/L2% of limit
ChlorideA naturally occurring salt compound.	21 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg21 mg/Lrange15–29 mg/L Ralston WTPPlant avg11 mg/Lrange9.3–14 mg/L
SulfateA naturally occurring mineral from rock and soil.	32 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg32 mg/Lrange23–44 mg/L Ralston WTPPlant avg20 mg/Lrange17–26 mg/L

Physical & aggregate

Contaminant	Measured	Federal limit	Status
TurbidityA measure of cloudiness from suspended particles in the water.	0.07 NTUAverageArvada WTP	None set	Within the limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg0.07 NTUrange0.02–0.39 NTU39% of limit Ralston WTPPlant avg0.03 NTUrange0.02–0.32 NTU32% of limit
AlkalinityA measure of the water's capacity to neutralize acids.	40 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg40 mg/Lrange24–51 mg/L Ralston WTPPlant avg26 mg/Lrange21–32 mg/L
HardnessA measure of dissolved calcium and magnesium minerals.	69 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (3)— Potential Effects, Arvada WTP, Ralston WTP Potential EffectsPlant Arvada WTPPlant avg69 mg/Lrange43–85 mg/L Ralston WTPPlant avg46 mg/Lrange33–62 mg/L
pHA measure of how acidic or basic the water is.	7.69AverageRalston WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg7.66range7.54–7.94 Ralston WTPPlant avg7.69range7.51–7.91
TOCTotal organic carbon — a measure of organic material dissolved in the water.	1.34AverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg1.34range1.16–1.66 Ralston WTPPlant avg1.22range1.04–1.41
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.	132 mg/LAverageArvada WTP	None set	Detected — no federal limit
+By source (2)— Arvada WTP, Ralston WTP Arvada WTPPlant avg132 mg/Lrange63–176 mg/L Ralston WTPPlant avg74 mg/Lrange48–122 mg/L

Source: Arvada, CO's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.