What's in Mills Service Area, CA tap water

31 contaminants were measured in the Mills Service Area, CA water system's 2024 annual report. Each is shown below against its federal limit — 5 sit at or above that limit.

See it on the mapFull source report ↗

Reporting year: 2024
Contaminants measured: 31
Over federal limit: 5
Approaching the limit: 1
Worst contaminant: Bromate
Service area: CA
Source: Utility CCR

At or above the federal limit

Approaching the limit (≥ 80%)

Total Dissolved Solids
Physical & aggregate
826 mg/L
83% of the limit

Where your water comes from · EPA SDWIS

Mills Service Area, CA's drinking water comes from ground water, drawn from 1 source.

Source

1ground water

TUNNEL

Treatment

1treatment plant

TUNNEL AND HORIZONTAL TREATED (CL2)

Distribution

0storage units

Also buys water from CLAWA.

Source: EPA SDWIS facilities inventory. Methodology.

Historical readings · EPA Six-Year Review (2012–2019)

1 contaminant historically over EPA limits in Mills Service Area, CA

About this data

Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.

Contaminant	Worst detection	EPA limit	Years (2012–2019)
TTHM worst: 2019	0.115 mg/L 1.4×	0.08 mg/L	'15'16'17'18'19
HAA5 worst: 2017	0.0124 mg/L within	0.06 mg/L	'15'16'17'18'19
NITRATE worst: 2012	1.02 mg/L within	10 mg/L	'12'13'14'15'16'17'18
NITRATE NITRITE worst: 2017	0.99 mg/L within	10 mg/L	'16'17
FLUORIDE worst: 2017	0.19 mg/L within	4 mg/L	'13'16'17
URANIUM worst: 2019	0.00402 ug/L within below national p90	30 ug/L	'13'19
DBAA worst: 2015	0.0062 mg/L	—	'15'16'17'18'19
DCAA worst: 2015	0.0019 mg/L	—	'15'16'17'18'19
MBAA worst: 2019	0.0013 mg/L	—	'19
TCAA worst: 2015	0.0025 mg/L	—	'15'16'17'18
BROMODICHLOROMETHANE worst: 2015	0.0083 mg/L	—	'15'16'17'18'19
BROMOFORM worst: 2015	0.0396 mg/L	—	'15'16'17'18'19
CHLOROFORM worst: 2015	0.0134 mg/L	—	'15'16'17'18'19
DIBROMOCHLOROMETHANE worst: 2015	0.0116 mg/L	—	'15'16'17'18'19

PWSID CA3610026 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
BromateA disinfection byproduct formed when bromide-containing water is treated with ozone.	0–19 ug/LReported levelMills	0.1 ug/LPublic health goal	At or above the limit
PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection.	2.3 ug/LAveragePerris Valley Wells M	6 ug/LMCL	Within the limit
+By source (8)— Perris Valley Wells M, East Valley Wells, Hemet Filtration Plant +5 more Perris Valley Wells MPlant avg2.3 ug/L38% of limit East Valley WellsPlant avgNot detected ug/L0% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit North Perris WellsPlant avgNot detected ug/L0% of limit

Metals

Contaminant	Measured	Federal limit	Status
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	90 ug/LReported levelSkinner	15 ug/LAction level	At or above the limit
ArsenicA naturally occurring element that also enters water from industry and agriculture.	2.5 ug/LAveragePerris Valley Wells M	10 ug/LMCL	Within the limit
+By source (8)— East Valley Wells, Perris Valley Wells M, Hemet Filtration Plant +5 more East Valley WellsPlant avg2.3 ug/Lrange0–5.6 ug/L56% of limit Perris Valley Wells MPlant avg2.5 ug/L25% of limit Hemet Filtration PlantPlant avg2.3 ug/L23% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit North Perris WellsPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit
BariumA metal from erosion of natural deposits and industrial discharge.	209 ug/LAveragePerris Valley Wells M	1000 ug/LMCL	Within the limit
+By source (8)— Perris Valley Wells M, East Valley Wells, North Perris Wells +5 more Perris Valley Wells MPlant avg209 ug/L21% of limit East Valley WellsPlant avg114 ug/Lrange0–187 ug/L19% of limit North Perris WellsPlant avg130 ug/Lrange120–140 ug/L14% of limit Skinner Filtration PlantPlant avg116 ug/L12% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit
Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium.	1.2 ug/LAveragePerris Valley Wells M	10 ug/LMCL	Within the limit
+By source (8)— Perris Valley Wells M, North Perris Wells, Skinner Filtration Plant +5 more Perris Valley Wells MPlant avg1.2 ug/L12% of limit North Perris WellsPlant avgNot detected ug/Lrange0–0.2 ug/L2% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit East Valley WellsPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit
AluminumA common element sometimes used as a treatment coagulant.	74 ug/LAverageSkinner Filtration Plant	1000 ug/LMCL	Within the limit
+By source (8)— Skinner Filtration Plant, Mills Filtration Plant, Perris Valley Wells M +5 more Skinner Filtration PlantPlant avg74 ug/Lrange0–160 ug/L16% of limit Mills Filtration PlantPlant avgNot detected ug/Lrange0–110 ug/L11% of limit Perris Valley Wells MPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit East Valley WellsPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit North Perris WellsPlant avgNot detected ug/L0% of limit
CopperA metal that enters water from corroding household plumbing.	90 ug/LReported levelEast Valley	1300 ug/LAction level	Within the limit
IronA naturally occurring metal common in groundwater.	Not detected ug/LAveragePerris Valley Wells M	300 ug/LMCL	Within the limit
+By source (8)— Desalination Complex L, East Valley Wells, Perris Valley Wells M +5 more Desalination Complex LPlant avgNot detected ug/Lrange0–668 ug/L223% of limit East Valley WellsPlant avgNot detected ug/Lrange0–213 ug/L71% of limit Perris Valley Wells MPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit North Perris WellsPlant avgNot detected ug/L0% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit
ManganeseA naturally occurring metal from soil and rock.	Not detected ug/LAverageHemet Filtration Plant	50 ug/LMCL	Within the limit
+By source (8)— Desalination Complex L, Hemet Filtration Plant, Perris Filtration Plant +5 more Desalination Complex LPlant avgNot detected ug/Lrange0–24 ug/L48% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit East Valley WellsPlant avgNot detected ug/L0% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit North Perris WellsPlant avgNot detected ug/L0% of limit Perris Valley Wells MPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit
SeleniumA trace element from natural deposits and industrial discharge.	Not detected ug/LAverageNorth Perris Wells	50 ug/LMCL	Within the limit
+By source (8)— East Valley Wells, North Perris Wells, Perris Valley Wells M +5 more East Valley WellsPlant avgNot detected ug/Lrange0–12 ug/L24% of limit North Perris WellsPlant avgNot detected ug/L0% of limit Perris Valley Wells MPlant avgNot detected ug/L0% of limit Skinner Filtration PlantPlant avgNot detected ug/L0% of limit Hemet Filtration PlantPlant avgNot detected ug/L0% of limit Perris Filtration PlantPlant avgNot detected ug/L0% of limit Mills Filtration PlantPlant avgNot detected ug/L0% of limit Desalination Complex LPlant avgNot detected ug/L0% of limit

Physical & aggregate

Contaminant	Measured	Federal limit	Status
pHA measure of how acidic or basic the water is.	6.3–8.1Reported levelMills	6.5MCL	At or above the limit
+By source (2)— EMWD's Entire Distribution System, East Valley EMWD's Entire Distribution SystemZone 123% of limit East ValleyZone 122% of limit
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.	826 mg/LAveragePerris Valley Wells M	1000 mg/LMCL	Approaching the limit
+By source (8)— Perris Valley Wells M, Perris Filtration Plant, East Valley Wells +5 more Perris Valley Wells MPlant avg826 mg/Lrange800–852 mg/L85% of limit Perris Filtration PlantPlant avg289 mg/Lrange199–715 mg/L72% of limit East Valley WellsPlant avg313 mg/Lrange196–582 mg/L58% of limit Skinner Filtration PlantPlant avg566 mg/Lrange560–572 mg/L57% of limit Desalination Complex LPlant avg332 mg/Lrange259–462 mg/L46% of limit North Perris WellsPlant avg396 mg/Lrange381–412 mg/L41% of limit Hemet Filtration PlantPlant avg228 mg/Lrange157–305 mg/L31% of limit Mills Filtration PlantPlant avg220 mg/Lrange178–263 mg/L26% of limit
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.	1120 uS/cmAveragePerris Valley Wells M	1600 uS/cmMCL	Within the limit
+By source (8)— Perris Filtration Plant, Perris Valley Wells M, East Valley Wells +5 more Perris Filtration PlantPlant avg502 uS/cmrange346–1210 uS/cm76% of limit Perris Valley Wells MPlant avg1120 uS/cm70% of limit East Valley WellsPlant avg509 uS/cmrange316–938 uS/cm59% of limit Skinner Filtration PlantPlant avg910 uS/cmrange903–917 uS/cm57% of limit North Perris WellsPlant avg612 uS/cmrange591–643 uS/cm40% of limit Desalination Complex LPlant avg518 uS/cmrange307–629 uS/cm39% of limit Hemet Filtration PlantPlant avg396 uS/cmrange280–527 uS/cm33% of limit Mills Filtration PlantPlant avg392 uS/cmrange317–466 uS/cm29% of limit
OdorA measure of detectable smell in the water.	1Reported levelMills	3MCL	Within the limit
+By source (3)— North Perris, EMWD's Entire Distribution System, East Valley North PerrisZone 33% of limit EMWD's Entire Distribution SystemZone 33% of limit East ValleyZone 33% of limit
ColorA measure of visible tint in the water.	2AverageSkinner Filtration Plant	15MCL	Within the limit
+By source (10)— EMWD's Entire Distribution System, East Valley, Hemet Filtration Plant +7 more EMWD's Entire Distribution SystemZone 100% of limit East ValleyZone 100% of limit Hemet Filtration PlantPlant avg1.9range0–2.517% of limit Mills Filtration PlantPlant avg2range1–213% of limit Skinner Filtration PlantPlant avg2range1–213% of limit East Valley WellsPlant avgNot detected0% of limit North Perris WellsPlant avgNot detected0% of limit Perris Filtration PlantPlant avgNot detected0% of limit Desalination Complex LPlant avgNot detected0% of limit Perris Valley Wells MPlant avgNot detected0% of limit
TurbidityA measure of cloudiness from suspended particles in the water.	Not detected NTUAveragePerris Filtration Plant	5 NTUMCL	Within the limit
+By source (11)— East Valley, EMWD's Entire Distribution System, North Perris Wells +8 more East ValleyZone 20% of limit EMWD's Entire Distribution SystemZone 8% of limit North Perris WellsPlant avgNot detected NTUrange0–0.3 NTU6% of limit North PerrisZone 6% of limit East Valley WellsPlant avgNot detected NTUrange0–0.26 NTU5% of limit Desalination Complex LPlant avgNot detected NTU0% of limit Perris Valley Wells MPlant avgNot detected NTU0% of limit Perris Filtration PlantPlant avgNot detected NTUrange0.74 NTU Hemet Filtration PlantPlant avgNot detected NTUrange0.15 NTU Mills Filtration PlantPlant avgNot detected NTUrange0.08 NTU Skinner Filtration PlantPlant avgNot detected NTUrange0.07 NTU

Disinfectants

Contaminant	Measured	Federal limit	Status
ChlorineA disinfectant added to drinking water to kill bacteria and viruses.	0–4.3 mg/LReported levelEMWD's Entire Distribution System	4 mg/LMRDL	At or above the limit
+By source (4)— EMWD's Entire Distribution System, East Valley, City of Perris +1 more EMWD's Entire Distribution SystemZone 108% of limit East ValleyZone 102% of limit City of PerrisZone 43% of limit North PerrisZone 20% of limit

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
ChlorideA naturally occurring salt compound.	233 mg/LAveragePerris Valley Wells M	500 mg/LMCL	Within the limit
+By source (8)— Perris Valley Wells M, Desalination Complex L, Perris Filtration Plant +5 more Perris Valley Wells MPlant avg233 mg/L47% of limit Desalination Complex LPlant avg115 mg/Lrange95–145 mg/L29% of limit Perris Filtration PlantPlant avg71 mg/Lrange48–120 mg/L24% of limit East Valley WellsPlant avg33 mg/Lrange9.8–105 mg/L21% of limit Skinner Filtration PlantPlant avg96 mg/Lrange92–100 mg/L20% of limit North Perris WellsPlant avg91 mg/Lrange86–97 mg/L19% of limit Hemet Filtration PlantPlant avg58 mg/Lrange38–84 mg/L17% of limit Mills Filtration PlantPlant avg54 mg/Lrange41–67 mg/L13% of limit
SulfateA naturally occurring mineral from rock and soil.	199 mg/LAverageSkinner Filtration Plant	500 mg/LMCL	Within the limit
+By source (8)— Perris Filtration Plant, Skinner Filtration Plant, East Valley Wells +5 more Perris Filtration PlantPlant avg46 mg/Lrange19–224 mg/L45% of limit Skinner Filtration PlantPlant avg199 mg/Lrange195–203 mg/L41% of limit East Valley WellsPlant avg56 mg/Lrange9.7–177 mg/L35% of limit Perris Valley Wells MPlant avg53 mg/L11% of limit Mills Filtration PlantPlant avg34 mg/Lrange21–47 mg/L9% of limit Hemet Filtration PlantPlant avg30 mg/Lrange15–46 mg/L9% of limit North Perris WellsPlant avg28 mg/Lrange22–34 mg/L7% of limit Desalination Complex LPlant avg21 mg/Lrange15–29 mg/L6% of limit
NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits.	Not detected mg/LAverageSkinner Filtration Plant	1 mg/LMCL	Within the limit
+By source (8)— Perris Filtration Plant, Hemet Filtration Plant, Desalination Complex L +5 more Perris Filtration PlantPlant avgNot detected mg/Lrange0–0.83 mg/L83% of limit Hemet Filtration PlantPlant avgNot detected mg/Lrange0–0.8 mg/L80% of limit Desalination Complex LPlant avgNot detected mg/Lrange0–0.53 mg/L53% of limit Skinner Filtration PlantPlant avgNot detected mg/L0% of limit East Valley WellsPlant avgNot detected mg/L0% of limit Mills Filtration PlantPlant avgNot detected mg/L0% of limit North Perris WellsPlant avgNot detected mg/L0% of limit Perris Valley Wells MPlant avgNot detected mg/L0% of limit

Radionuclides

Contaminant	Measured	Federal limit	Status
Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances.	18.6 pCi/LAverageHemet Filtration Plant	50 pCi/LMCL	Within the limit
+By source (7)— East Valley Wells, Hemet Filtration Plant, Desalination Complex L +4 more East Valley WellsPlant avg8.5 pCi/Lrange0–20 pCi/L40% of limit Hemet Filtration PlantPlant avg18.6 pCi/L37% of limit Desalination Complex LPlant avg14 pCi/Lrange13–16 pCi/L32% of limit Perris Filtration PlantPlant avg12.9 pCi/L26% of limit Perris Valley Wells MPlant avg9.6 pCi/L19% of limit Skinner Filtration PlantPlant avg4 pCi/Lrange0–5 pCi/L10% of limit Mills Filtration PlantPlant avgNot detected pCi/L0% of limit
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.	5.2 pCi/LAveragePerris Valley Wells M	15 pCi/LMCL	Within the limit
+By source (8)— East Valley Wells, Perris Valley Wells M, Desalination Complex L +5 more East Valley WellsPlant avg3.5 pCi/Lrange0–10.6 pCi/L71% of limit Perris Valley Wells MPlant avg5.2 pCi/L35% of limit Desalination Complex LPlant avg3.9 pCi/Lrange3.3–4.5 pCi/L30% of limit Skinner Filtration PlantPlant avgNot detected pCi/Lrange0–4 pCi/L27% of limit North Perris WellsPlant avgNot detected pCi/Lrange0–3.9 pCi/L26% of limit Mills Filtration PlantPlant avgNot detected pCi/L0% of limit Hemet Filtration PlantPlant avgNot detected pCi/L0% of limit Perris Filtration PlantPlant avgNot detected pCi/L0% of limit
Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements.	0.48 pCi/LAverageNorth Perris Wells	5 pCi/LMCL	Within the limit
+By source (8)— North Perris Wells, Mills Filtration Plant, Hemet Filtration Plant +5 more North Perris WellsPlant avgNot detected pCi/Lrange0–1.2 pCi/L24% of limit Mills Filtration PlantPlant avgNot detected pCi/Lrange0–1 pCi/L20% of limit Hemet Filtration PlantPlant avgNot detected pCi/L0% of limit Desalination Complex LPlant avgNot detected pCi/L0% of limit Perris Valley Wells MPlant avgNot detected pCi/L0% of limit Perris Filtration PlantPlant avgNot detected pCi/L0% of limit Skinner Filtration PlantPlant avgNot detected pCi/L0% of limit East Valley WellsPlant avgNot detected pCi/L0% of limit

Microbial

Contaminant	Measured	Federal limit	Status
Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals.	0Reported levelMills	0MCLG	None detected
+By source (4)— East Valley, City of Perris, EMWD's Entire Distribution System +1 more East ValleyZone City of PerrisZone EMWD's Entire Distribution SystemZone North PerrisZone
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.	5Reported levelEMWD's Entire Distribution System	0MCLG	Detected — no federal limit
+By source (4)— EMWD's Entire Distribution System, East Valley, City of Perris +1 more EMWD's Entire Distribution SystemZone East ValleyZone City of PerrisZone North PerrisZone

Source: Mills Service Area, CA'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.